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REGIONAL ARCHAEOLOGY AND LOCAL INTERESTS IN COIXTLAHUACA, OAXACA

Published online by Cambridge University Press:  08 August 2017

Stephen A. Kowalewski*
Affiliation:
Department of Anthropology, University of Georgia, Athens, GA 30602, USA ([email protected])
Stefan P. Brannan
Affiliation:
Department of Anthropology, University of Georgia, Athens, GA 30602, USA ([email protected])
Marisol Yadira Cortés Vilchis
Affiliation:
Dirección de Salvamento Arqueológico INAH, Cordoba 45, Colonia Roma, Delegación Cuauhtémoc, 06700 Ciudad de México, México ([email protected])
Laura Diego Luna
Affiliation:
Estudios Mesoamericanos, Universidad Nacional Autónoma de México, Circuito de Posgrados, Edificio H, Cd. Universitaria, 04510 Ciudad de México, México ([email protected])
Gabriela García Ayala
Affiliation:
Centro de Investigación en Geografía Ambiental, UNAM-Morelia, Antigua Carretera a Pátzcuaro 8701, Colonia Ex Hacienda de San José de la Huerta, 58190 Morelia, Michoacán, Mexico ([email protected])
José Leonardo López Zárate
Affiliation:
INAH Delegación Oaxaca, Pino Suárez 715, Centro Histórico, 68000 Oaxaca, Oaxaca, Mexico ([email protected])
Fernando Méndez Sobel
Affiliation:
Colaborador Independiente, Oaxaca, Mexico ([email protected])
Laura R. Stiver Walsh
Affiliation:
Metro Nashville Public Schools, 2601 Bransford Avenue, Nashville, TN 37204, USA ([email protected])
Ellen B. Turck
Affiliation:
Upper Freehold Regional School District, 27 High Street, Allentown, NJ 08501, USA ([email protected])
John A. Turck
Affiliation:
National Park Service, Valley Forge National Historical Park, 1400 North Outer Line Drive, King of Prussia, PA 19406, USA ([email protected])
Sergei Vepretskiy
Affiliation:
State Academic University for the Humanities, Maronovsky St. 26, 119049 Moscow, Russia ([email protected])
*
([email protected], corresponding author)
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Abstract

The Recorrido Arqueológico de Coixtlahuaca (RAC) presents period-by-period settlement pattern maps for the valley of Coixtlahuaca in the northern Mixteca Alta. The RAC project made improvements in full-coverage survey methods. We identify limitations and suggest that similar projects in the future need to resolve several management and budget problems. The survey revealed two periods of heavy occupation, 700–300 BC and AD 1200–1520, separated by a long period of lower population. Archaeological and historical data indicate that during the AD 1200–1520 period, and probably earlier, small landholders organized in strong communities managed an intensive agroecosystem, investing in landesque capital. Urbanization was impressive, yet cities were aggregations of communities and barrios. Today local citizens pose questions about how the large prehispanic population could have organized and sustained itself; these questions coincide with anthropological interest in collective agency, property, landesque capital, and collapse.

En este artículo se presentan los mapas del patrón de asentamiento por período del valle de Coixtlahuaca, en el norte de la región de la Mixteca Alta, en el estado de Oaxaca, México. Estos datos fueron generados por el proyecto Recorrido Arqueológico de Coixtlahuaca (RAC). En el proyecto RAC se realizaron avances sobre los métodos de prospección de cobertura total. En este artículo se identifican ciertas limitaciones y se sugiere que proyectos similares a realizarse en el futuro deberán prever y resolver diversos problemas de presupuesto y gestión. Como resultado de la prospección se reconocieron dos periodos de intensa ocupación, 700-300 a.C. y 1200-1520 d.C., separados por un largo periodo de menor densidad poblacional. Los datos arqueológicos e históricos indican que durante el periodo de 1200 a 1520 d.C., y quizás antes, los pequeños productores agrícolas lograron el manejo de un agroecosistema intensivo, invirtiendo en capital en tierras (“landesque capital”) y organizándose en fuertes comunidades locales. Aunque la urbanización fue impresionante, estas ciudades eran agregados de comunidades y barrios. Las preguntas planteadas por los ciudadanos locales modernos acerca de cómo la numerosa población prehispánica pudo mantenerse y organizarse son relevantes para los temas antropológicos de agencia colectiva, propiedad, capital en la forma de enmiendas a la tierra y colapso.

Type
Articles
Copyright
Copyright © 2017 by the Society for American Archaeology 

The Recorrido Arqueológico de Coixtlahuaca (RAC) systematically surveyed a key region in Mesoamerica. The settlement patterns that emerged shed light on problems in ecological and political anthropology. These problems were succinctly phrased in two questions that citizens of Coixtlahuaca posed to us at a public forum at the conclusion of our 2008 pilot project: How could such a large number of people have lived here in the past, when today, with a much lower population, we can barely make a living? And, how were all those people organized? The questions are important today because living on this spectacularly eroded land is difficult, and people are constantly confronted with the costs and benefits of social cooperation, withdrawal, or conflict. Local communities sometimes alternate between impressive collective action and paralyzing factionalism.

Our research was not based on the local citizens’ questions—our goal from the start was to survey the region. But their questions coincide with more general anthropological concerns, and the problems are significant academically and practically. We made these questions the central theme of our successful proposal to the National Science Foundation for the regional survey. The population question involves agroecosystem processes that we are treating in detail, as are our colleagues the geomorphologists David Leigh and Genevieve Holdridge. In this article we focus on the question of social organization, although inevitably we refer to making a living as we address how people were organized.

¿Cómo se organizaron? ¿Cómo fueron organizados? Spanish and English share the ambiguity of the passive voice: How did they organize themselves? Or, how were they organized (by someone else)? A common perspective is that the elite organize society; they are the generative and most powerful force. The elite lead, establish cities, and populate them with their subjects. This is the perspective of the texts produced by Mesoamerican rulers. Nevertheless, recent studies using cooperation theory emphasize variation in degrees of autocratic or collective action (Blanton and Fargher Reference Blanton and Fargher2008; Carballo Reference Carballo2013a). Coixtlahuaca settlement archaeology and historical sources show that community organization existed prior to king and state, and was powerful and enduring enough to contest both. Society was a complicated dynamic of opposed strategies.

Study Area and Chronology

The valley of Coixtlahuaca is the upper basin of the Río Xiquila, the northernmost valley of the Mixteca Alta (Figure 1). Valley floors in the Mixteca Alta are about 2,100 m asl and mountain crests rise to 2,800 m asl. The Mixteca Alta is in the geographical center of Mesoamerica and within it the Coixtlahuaca valley has the best access to the Gulf Coast lowlands. Soil and water management have been key factors in Mixteca Alta cultural ecology (Kirkby Reference Kirkby1972; Spores Reference Spores1969). Valleys have deep deposits of the Yanhuitlán and similar sedimentary formations. Soils derived from these are fertile but notoriously erodible, and these two characteristics have played a major part in the human history of this region. Climate is temperate and semi-arid. Although each valley has permanent surface water, precipitation is erratic and, on average, marginal for rainfall agriculture, which places a premium on water control.

Figure 1. Location of Coixtlahuaca and surrounding places mentioned in the text.

We selected this area because it was a large and powerful city-state in Late Postclassic times (e.g., Durán Reference Durán and Ma1967:2:185–195). It had received little archaeological attention since Bernal's impressive study (Bernal 1948–Reference Bernal1949; Spores Reference Spores2007:50–51, 470). Surveying Coixtlahuaca would further expand the approximately 9,000 km2 area of archaeological coverage extending from central valleys of Oaxaca through much of the Mixteca Alta (Balkansky Reference Balkansky2006).

In the past, the Coixtlahuaca valley was home to speakers of Chocholtec (Ngigua, Ngiwa; Huesca et al. Reference Huesca, Esparza and Guzmán1984:2:3–18). Some towns also had speakers of Mixtec (van Doesburg Reference van Doesburg2001). Today only a few people speak an indigenous language. Many tell legends about the past, but the oral history has not been compiled and studied as fully as it should be (Grosser Lerner Reference Grosser Lerner2004; Jiménez García Reference Jiménez García2000; Rincón Mautner Reference Rincón Mautner1999). Coixtlahuaca has an important corpus of 13 native lienzos, which are graphic representations of geography and royal dynasty made in the sixteenth century. Below we juxtapose the archaeological and historical data, but more detailed research should be done now that the archaeology is better known.

The ceramic chronology (Table 1) of Coixtlahuaca valley is similar to the adjacent Nochixtlán and Tamazulapan valleys (Blomster Reference Blomster2004; Byland Reference Byland1980; Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009; Plunket Reference Plunket1983; Spores Reference Spores1972). Bernal carried out stratigraphic excavations at the Late Postclassic center in 1948–1949 and documented the ceramics. Our 2008–2011 work found evidence of Middle Formative through Early Classic occupation and pottery resembling ceramics from neighboring areas in the Mixteca Alta and the Valley of Oaxaca (Caso et al. Reference Caso, Bernal and Acosta1967; Flannery and Marcus Reference Flannery and Marcus1994). There are also links to Tehuacan, 60 km to the north (MacNeish et al. Reference MacNeish, Peterson and Flannery1970).

Table 1. Chronology, Sites, and Total Site Area for the Valley of Coixtlahuaca.

Field and Lab Methods

The RAC survey began in 2008 at the ancient city of Coixtlahuaca. We used systematic surface survey, controlled collection, and multitechnique prospection, the latter carried out by our collaborators at the Laboratorio de Prospección, Instituto de Investigaciones Antropológicas, Universidad Nacional Autónoma de México (UNAM-IIA), under the direction of Luís A. Barba Pingarrón. We studied the history and internal makeup of the city, mapped its limits over time, improved our understanding of the chronology, and investigated residential density in 10 places. This work showed that Coixtlahuaca extended continuously, without gaps, over 3,000 ha.

In 2009, along with the UNAM-IIA team, we focused on three Late Postclassic residences and carried out test excavations to evaluate the remote sensing data. These studies provided a provisional estimate of residential density of four to seven houses per hectare for the Late Postclassic city (Kowalewski et al. Reference Kowalewski, Pingarrón, Vázquez, Vilchis, Ayala, Zárate, Butrón, Pluckhahn, Steere and Flores2011).

The 2011 project was the full-coverage survey of the whole valley; we have described the methods elsewhere (Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009:15–27). We were able to make important improvements in data management in this phase by using GIS more extensively to organize information, including GPS points and tracks, collections, photographs, notes, features, municipal boundaries, and other data. Each three- or four-person field crew was responsible for data entry using a common template. In earlier regional projects, phase-by-phase settlement pattern maps were not completed until months after fieldwork, but in 2011 we drew component boundaries within a few days of a site being mapped, updating the field information as ceramic collections were initially classified and later reviewed. Early decision on component boundaries greatly improves data quality. Our experience suggests that regional surveys should make full use of databases and GIS, concurrent with fieldwork, for all information and research products. Artifacts were described and typed up within a few days of their collection and reviewed several times (by SAK and LRS). We photographed every artifact, front and back, by collection.

For each of 18 communities, we wrote individual reports describing the objectives, methods, results, significance, and need for preservation, and attached maps showing site locations. Field crews submitted the reports to communities in June 2011.

Regional surveys are always a tense balance between two competing objectives that cannot be maximized at the same time: covering as much area as possible and collecting more information on each site. It is too facile to conclude that the optimal solution depends on research objectives. In practice, research objectives do not anticipate every situation. The tension between extensive coverage and richer information does not disappear. Especially near the end of the field season, crews had too much to do and too little time. Later we found omissions and inconsistencies that we should have caught during earlier error-checking. We had hoped to survey 1,000 km2, but completed about 660 km2 due to local political difficulties, because sites were more extensive than anticipated, and because of limitations on project resources and flexibility. The most significant gap in coverage is Tepelmeme, notable for the precolumbian paintings in the cave known as the Puente Colosal (Rincón Mautner Reference Rincón Mautner2005; Urcid Reference Urcid2004).

We collected 579 lots of artifacts at Coixtlahuaca in 2008. The 2011 regional survey collected 264 lots, and many hundreds of collections were inspected but not taken. Because smaller collections affect chronological discernment, more collections are desirable, and this requires standardized procedures for inspecting and collecting, which should be made clear in the research plan. Crews need to know about the ceramics at the outset.

Time spent on nonresearch issues is a concern. Project diplomacy has become more difficult and time-consuming in Oaxaca in the last several decades, with the weakening of federal and state government authorities and sometimes unpredictable local disputes and factions. In most instances the time spent in local diplomacy is rewarding, however. We learned a lot from community members and we appreciate having had the opportunity to work with them. Dealing with administrative obstacles imposed by one's university is also difficult and time-consuming, but in no sense rewarding. Many of the difficulties just cited should be anticipated at the proposal stage and dealt with in the budget. A project of this complexity requires more attention to management today than was once the case, and this should be addressed early in the planning stage.

Settlement Patterns over Time

Paleoindian and Archaic (Prior to 2000 BC)

We found no evidence of occupation in the Paleoindian period. Pleistocene megafaunal remains are often found in this part of Mexico, but thus far not in association with humans. Rock art (e.g., Ramírez Reference Ramírez Barrera2014) and charcoal from a hearth dated to 3290–2920 cal BC (Rincón Mautner Reference Rincón Mautner1999:681–691, 694) are the only documented evidence for the Archaic.

Early Formative (2000–700 BC)

We have only three small habitation sites (Figure 2). These are on low hills overlooking the valley floor. In each case there are a few Middle Cruz sherds (ca. 1000 BC). One site was identified only after visiting colleague Marc Winter spotted a couple of sherds on a lab table. This site and another required revisits, and the third was quite disturbed, being in the middle of a present-day village. Early Formative sites are difficult to identify because diagnostics are sparse, there is heavy later occupation, and early occupations are more likely to be eroded away or buried by sediments.

Figure 2. Late Cruz (700–300 BC) settlements in the valley of Coixtlahuaca. The black line shows the survey area. The edges of the gray shading indicate the 2,100 m and 24,00 m asl contours. The three known Middle Cruz sites are marked by x’s.

Our geomorphological study suggests that more than a few farming households had settled here by 1500 BC. In a deeply incised stream bank near San Juan Bautista Coixtlahuaca, Leigh and Holdridge found a 6 m high cross-channel check dam. Ten radiocarbon samples date it to 3500–3400 cal BP (Leigh et al. Reference Leigh, Kowalewski and Holdridge2013). A series of dams was built to control the force of the water during storms. This implies that there was cooperation among farmers, the number dependent on the size of the stream. Perhaps people had committed to sedentism by this early date, as MacNeish has proposed for Tehuacan, in “(linear) waterway hamlets” near moist barranca bottoms (MacNeish et al. Reference MacNeish, Fowler, Cook, Peterson, Nelken-Terner and Neely1972:155–160, 499–500).

Middle Formative (700–300 BC)

The Middle Formative was a period of expansion (Figure 2). The number of settlements jumped to 245. Total settlement area exceeded 3,000 ha. One site alone extended continuously over 1,300 ha. Along the Río Grande de Ihuitlán, settlement covered large parts of the municipalities of Teopan, Jicotlán, Tepetlapa, and Ihuitlán. Tequixtepec and Naduza-Ñiaxugue in Coixtlahuaca (García Ayala Reference García Ayala2011) were also major towns. These sites are extensive and offer dense scatters of pottery and chert debitage, with bell-shaped pits, house foundations, and residential terraces.

Middle Formative ceramics resemble Rosario, Monte Albán Ia, and Monte Albán Ib in the Valley of Oaxaca (Caso et al. Reference Caso, Bernal and Acosta1967; Drennan Reference Drennan1976) and Late Cruz (Spores Reference Spores1972) and the Yucuita phase (Blomster Reference Blomster2004) in the Mixteca Alta. Our collections are not sufficient in size or number to map change in settlement size by shorter phases, since many diagnostics are relatively rare, but our impression is that settlement began in the early third of the Late Cruz period and was most extensive in the late third.

Most occupations are in open valley floors. There are also hilltop villages, some with rings of habitation terraces. The largest and best-preserved of the hilltop sites are Naduza-Ñiaxugue, Cerro La Flor at the northern edge of the region, and Tlapiltepec, where the center of the 1,300 ha settlement is an impressive hill town with rings of 6 m high terrace walls on the slopes and a small civic-ceremonial precinct on top of the hill.

The Coixtlahuaca valley has some of the most extensive Middle Formative sites recorded in Mesoamerica. The density of houses in these extensive artifact scatters is unknown. Visible house foundations are rare. If the density were 10 persons per hectare (the upper limit of “scattered village” and the lower limit of “compact low density” ranges [Sanders et al. Reference Sanders, Parsons and Santley1979:38–39]), the region could have had almost 30,000 people shortly before 300 BC. Radiocarbon and stratigraphic dating of check dams exposed in stream profiles indicate that agricultural terracing was extensive during this period.

There was not a lot of public architecture—12 sites have a total of 22 small platform mounds that may date to this period. Platforms are widely distributed. A few are at the centers of large settlements but most are at small sites or in boundary situations on hilltops at the edges of drainages.

Late and Terminal Formative (300 BC–AD 200)

This period (the Early and Late Ramos phases, coeval with Monte Albán Late I and II) saw a demographic trough (Figure 3). In the Late Formative, most of the valley was abandoned, except for the town of Naduza-Ñiaxugue (more than 100 ha); Cerro La Flor, a lingering small occupation at the formerly huge settlement at Tlapiltepec; and a few small sites that were probably not occupied for very long. In the Terminal Formative, Naduza-Ñiaxugue persisted as a large town (over 180 ha), Cerro La Flor was abandoned, and there were just a few other small sites. Naduza-Ñiaxugue resembles its peer Yucuita, 20 km to the south in the Nochixtlán valley (Plunket Reference Plunket1983).

Figure 3. Ramos (300 BC–AD 200) settlements in the valley of Coixtlahuaca.

In sum, except for Naduza-Ñiaxugue, the Coixtlahuaca region was little occupied from about 300 BC to about AD 200. This decline was extreme, but it seems to coincide with the militarization and population stasis or decline seen in neighboring regions in the same period. It would be difficult to attribute the partial abandonment of Coixtlahuaca to deficiency in the ceramic chronology, since the same time-sensitive styles occur in Coixtlahuaca, the central Mixteca Alta, and the Valley of Oaxaca throughout the Formative. Contemporary pottery assemblages from Naduza-Ñiaxugue are equal in quality and frequency of decoration to those from the Valley of Oaxaca, and many examples could serve as type illustrations in the standard work on Monte Albán ceramics (Caso et al. Reference Caso, Bernal and Acosta1967).

Early Classic (AD 200–600)

From about AD 200, people began settling at more places in the southern part of the valley (Figure 4). A new mountaintop town was founded at Cerro Verde. The northern half of the valley was only lightly and ephemerally settled, and was probably a political frontier.

Figure 4. Early Las Flores (AD 200–600) settlements in the valley of Coixtlahuaca.

We identified some surface collections as Terminal Formative–Early Classic Transition (Caso et al. Reference Caso, Bernal and Acosta1967; Stiver Reference Stiver2001). Other collections, especially small ones, are ambiguous and are assigned to Early Las Flores. Collections with Transition attributes come from the southern valley, at Cerro Verde and Coixtlahuaca, so it is likely that the growth in settlement began first in that area.

Cerro Verde (Nudo Mixteco) is the divide between the Pacific-draining Ríos Balsas and Verde, and the Gulf-draining Río Papaloapan. Settlement was on the peaks, ridges, and slopes east of Cerro Verde, 500 m above and 2 km distant from the valley floor. We recorded 678 stone terrace walls, the total length of which is 31.7 km. Most terraces were residential but some were built as ramps or defensive walls, for planting, or to stabilize slopes. Settlement began in the Transition period and spread to cover a maximum of 197 ha in the Early Classic. We identified no Late Classic or Early Postclassic settlements in this region.

The distribution of civic-ceremonial architecture (CCA) at Early Classic Cerro Verde is decidedly noncentralized. Modest-sized platform mounds occur on six different peaks and one saddle. One group has three mounds, one has two, and five have one. Small plazas are at each of these groups and on two other peaks. The town thus looks like a collection of barrios, a pattern found elsewhere in the Mixteca Alta (Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009; Stiver Reference Stiver2001).

The town of Naduza-Ñiaxugue continued to be densely settled and was a secondary center to Cerro Verde. Founded by 700 BC, it was the longest continuously occupied settlement in the region.

The settlement pattern in the southern Coixtlahuaca valley has a form similar to the contemporaneous polities in the central Mixteca Alta: a territory of 50–150 km2; a population of 5,000–15,000 inhabitants; a civic-ceremonial center, usually on a high, defendable mountain; secondary centers or barrios with public buildings at lower elevations; and a variety of settlements close to the valley floor. This pattern was interpreted as the ñuu, the Mixtec term for the small state (Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009:305–314). In Chocholtec, the corresponding term is saçê (see below).

Late Classic, Epiclassic, and Early Postclassic (AD 600–1200)

The Late Classic is problematic in the Mixteca Alta. Excavations at Yucuñudahui (Caso Reference Caso1938; Spores Reference Spores1974) and Yucundaa (Spores and Robles García Reference Spores and García2014) found abundant Early Classic and Late Postclassic occupation, but Late Classic and Early Postclassic contexts are rare and not well documented. Radiocarbon dates are lacking. The nearest place with substantial assemblages in the AD 600–1000 time range is Peñoles in the eastern Mixteca Alta (Finsten Reference Finsten, Peregrine and Feinman1996).

In 19 of our collections, we found sherds similar to a ware identified in Veracruz, Puebla, and elsewhere in Oaxaca as metálica or false plumbate, which should date to about AD 1000 (Bey and Ringle Reference Bey III, Ringle, Kowalski and Kristian-Graham2007; Fahmel Reference Fahmel Beyer1988). Pastes are fine-tempered, hard, and fired orange; surfaces are slipped dark gray and burnished, with pre-firing incising of medium-width simple lines or post-firing thin lines scratched through the slip. Vessels are mostly bowls—slightly out-leaning, cylindrical, or barrel-shaped—and rims are simple and direct. Further work may be able to identify co-occurring wares.

Figure 5 shows that collections having metálica sherds are widespread, but none are from the Coixtlahuaca urban center. Tentatively we suggest a repopulation of the valley in Early Postclassic times. Sites where metálica occurs are generally small and located on hilltops in the upper reaches of drainages, a situation suited for small populations lacking the labor to maintain terrace systems covering whole basins. This scenario requires testing.

Figure 5. Surface collections having metálica or false plumbate, a possible Early Postclassic marker.

Late Postclassic (AD 1200–1520)

This was the time of heaviest occupation (Figure 6). We mapped 10,215 ha of settlement. Society was at its most urbanized; rural economic development was greater than at any time before or since.

Figure 6. Late Natividad (AD 1200–1520) settlements in the valley of Coixtlahuaca.

Some Late Postclassic sites are remarkably extensive. The city of Coixtlahuaca has an unbroken spread of Late Postclassic artifacts covering 30 km2, not counting nearby barrios such as the 6 km2 of Suchixtlahuaca. The central sectors alone of Tequixtepec and Ihuitlán covered 9 km2 each. Essentially the whole valley of Tulancingo is one archaeological site of 8 km2. To give an idea of demographic scale, a density of 10 to 25 persons per hectare (compact low-density village in the Basin of Mexico [Sanders et al. Reference Sanders, Parsons and Santley1979:38–39] and the range used most frequently in highland Oaxaca surveys [Kowalewski et al. Reference Kowalewski, Feinman, Finsten, Blanton and Nicholas1989:35]) would yield a range of 100,000 to 250,000 people in the valley of Coixtlahuaca, 10 to 25 times the population today. Further refinements in population estimates could be made by considering sites of higher density (Coixtlahuaca itself, for one) and issues of absolute contemporaneity.

The Mixteca Alta as a whole was quite urbanized and the Coixtlahuaca valley even more so. About 85% of its population lived in settlements greater than 40 ha. Using an urban threshold of 100 ha (1,000 to 2,500 people), the urbanization rate would be 77%, which is high compared to other urban societies historically (de Vries Reference de Vries1984).

The largest sites were urban in physical and demographic size. They were top-ranked central places in a system of cities that extended well beyond this valley. But what portion of their inhabitants was engaged in providing goods and services not found in other places? How socially heterogeneous were these centers? Was this an “agrarian urbanism” (Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009:346–348)? Our systematic surface collections at Coixtlahuaca identified no zones of specialized production nor any obviously poor sectors. There was a fair degree of cost-uniformity in household refuse over the city, rather than concentration of wealth in the center (Steere and Kowalewski Reference Steere and Kowalewski2012). Our study was only a first step, and surface collections are not sufficient in themselves to answer these complex questions.

Were these places just overgrown villages? Did people have milpas next to their houses? Perhaps, but the residential density was such that the urban space was not sufficient to provide the amount of food required. Most of the urban dwellers may have been farming outside the city limits, as in traditional Yoruba cities, but the rural areas were already heavily populated and city residents would have been competing for land with many thousands of rural people (Figure 6).

What activities and functions went on in cities such as Coixtlahuaca, especially at the household level? This is a broader, Mesoamerica-wide problem brought to light when systematic surveys began documenting the scale of cities and the character of their hinterlands.

The Late Postclassic saw intensive rural development. Settlements were distributed so as to locate farmers near the fields that required the most labor and attention. This meant a dispersed settlement pattern—81% of sites (325) were less than 10 ha in size. Rural settlements were more dispersed in some drainages and more nucleated in others. In the Teopan tributary, we found 44 sites totaling 93 ha; Concepción Buenavista, outside the city of Ihuitlán, had 51 sites totaling 87 ha. Nativitas had 41 sites totaling 487 ha, including two of 113 ha each. Coixtlahuaca's immediate hinterland had the same pattern of numerous hamlets and small villages plus seven midsize places of 40 to 200 ha or more.

Smallholders and communities were embedded in a large-scale commercial economy. Sixteenth-century sources tell of a major international market in Coixtlahuaca (Códice Chimalpopoca Reference Códice and Velázquez1945; Durán Reference Durán and Ma1967:2:185–195), and there were other markets as well (van Doesburg Reference van Doesburg2002). Given the large population and degree of urbanization, undoubtedly there was a high degree of market dependence. Comparative urban and rural household studies are needed to document this economy.

Evidence of specialized production and distribution of goods is limited. We identified two andesite quarry-workshops for making manos and metates (one at Cerro Nata covers 2 ha) and several sites used for chert working. All obsidian was imported and most was recovered from Late Postclassic contexts. Obsidian densities are higher in the city of Coixtlahuaca than in other places, but obsidian is widely distributed across all neighborhoods. We found none of the standard evidence for places of pottery making, yet the quantities of ceramic refuse are astounding. In historic times, pottery-making villages in the Mixteca Alta were not located in the wide and fertile valleys but in more agriculturally marginal places such as Tonaltepec, just outside our survey area. One hypothesis is that potters and farmers were engaged in market exchange in which there were zones of specialization, following the principle of comparative advantage (Kowalewski Reference Kowalewski, Fargher and Espinoza2016).

The CCA is revealing in several respects (Figure 7). Our analysis attempts to capture public buildings as opposed to ordinary domestic structures. Our criteria are size, a platform greater than 1 m in height, and placement in a prominent position or association with a plaza. The top of the platform reflects the potential size and form of the building it once supported. Platform tops are distributed in three classes: “small” (n = 49) have tops less than 10 m in length (the smallest is 24 m2); “medium” (n = 32) have one dimension greater than 10 m but top areas less than 200 m2; and “large” (n = 26) have top areas greater than 200 m2. Dating is by associated ceramics from the surface or from exposed fill, thus “Late Postclassic” may mean platform construction or continued use of an earlier platform. Structures that we could not date by associated sherds, such as two small platforms on the Cerro Verde peak, are not included here. By these criteria the CCA count is 107. The “?” symbol in Figure 7 indicates places where public buildings probably existed but are obscured, such as under the sixteenth-century Convento de San Juan Bautista Coixtlahuaca.

Figure 7. Distribution of Late Postclassic platform mounds for civic-ceremonial buildings, by size class, with outlines of Late Postclassic settlements. Numbers refer to number of mounds in a size class in a group at a specific place. Groups are indicated by numbers greater than one and by strings separated by commas. Platform size classes: largest have top areas > 200 m2, shown with a number in the largest font size; medium have top areas < 200 m and top lengths > 10 m, shown with a number in medium-size italic font; and small have tops with no dimension > 10 m but are considered to be public buildings, shown with number in smallest font. Positions of numbers approximate locations. For example, in the center of Coixtlahuaca is a group of 4 large, 5 medium, and 4 small platforms. Cerro Zapotal, southeast of Coixtlahuaca, has 3 small mounds at 3 different places.

The Valley of Coixtlahuaca has relatively few CCA structures. The count is only a quarter of that in the central Mixteca Alta (Kowalewski et al. Reference Kowalewski, Balkansky, Walsh, Pluckhahn, Chamblee, Rodríguez, Espinoza and Smith2009:412–483). Its major center has fewer platform mounds than the Pueblo Viejo at Teposcolula, a much smaller city (Stiver Reference Stiver2001:93).

The platforms are small. The tallest is 7 m high. The largest are smaller than their contemporaries in the central Mixteca Alta and the Valley of Oaxaca. The small number of platforms and their small size is characteristic of the entire Coixtlahuaca sequence after the Formative. Public architecture of imposing dimensions concentrates labor, symbolic meaning, and psychological effect in singular, central places (e.g., Burger and Rosenswig Reference Burger and Rosenswig2012). This concentration was weak in the valley of Coixtlahuaca. Yet there was a built environment that was imposing, full of symbolic meaning, and perhaps psychologically moving—the completely terraced, monumental landscape (cf. Conklin Reference Conklin1980).

Platforms tend to be widely distributed rather than built in one central place. The CCA evidence suggests that cities and towns were aggregates of barrios rather than distinctive places integrated by dominant central institutions. At the regional capital, 19 of the 32 platforms are scattered in outlying sectors and 13 are in a central precinct. The city of Tequixtepec had three major barrios, each with CCA, and even in these three sectors the buildings were not all grouped in one place. Nativitas and Suchixtlahuaca are other large settlements with the same pattern of a few public buildings scattered in different sectors. At the city of Ihuitlán, we recorded a single place that had perhaps two platforms. Tulancingo likewise had little Postclassic public construction apart from an unusual group of five small platforms atop the Loma Tortolita (turtle dove), which may be the ritual place depicted on the Lienzo de Tlapiltepec and the Lienzo Seler II/Coixtlahuaca II (Brownstone Reference Brownstone2015:111, 121), as suggested by van Doesburg (Reference van Doesburg and García2004).

Small groups of buildings on hilltops mark the edges of territories. For example, the edges of the small valley at Teopan have two nearly identical four-mound-and-patio groups. Similar groups are found in the central Mixteca Alta and in the Valley of Oaxaca, so this is a pattern that crossed regional and linguistic lines. Northeast of Tequixtepec, the Cerro Dade (hill of the market in Chocholtec) and Cerro de Enmedio, both defensible, have formal mound groups. A single small platform in an enclosure was built on the summit of the fortified Cerro de La Campana south of Tulancingo. The limits of some large settlements also may be marked by mound groups. Coixtlahuaca has four-mound groups at its north and south ends, and its major barrio of Suchixtlahuaca to the west has two formal groups.

It is not clear what scale of territory or organization these boundary sites may have marked. Each potentially pertained to a local territorial organization; for example, Teopan could have had an eastern and a western barrio. Or a ruling house might have placed a cadet lineage at some remove from itself, in which case the group of buildings, say the three at Otla, would be a branch pertaining to a ruling dynasty.

Terracing and Land Tenure

It has long been known that farmers in the Mixteca Alta covered the land with cross-channel (lama-bordo) and contour terraces to retain and build up soil and moisture. Terraced fields, especially lama-bordos, were more productive than extensive rainfall-dependent fields (Spores and Balkansky Reference Spores and Balkansky2013:8–79, 108–109). In the banks of down-cut arroyos we recorded 284 ancient check dams. This number is almost meaningless because we could not search for them systematically and many that once existed are now buried or eroded away. A more methodical search by Leigh and Holdridge found 50 on a single stream (Leigh et al. Reference Leigh, Kowalewski and Holdridge2013). Every inhabited stream drainage had chains of check dams.

Identifying ancient hillside terraces is more problematic. Farmers constantly shift the stone walls to cope with soil movement and changing land tenure, so the terraces in places with active fields are recent creations. Slopes where fields were abandoned in the past have been scoured by sheet and gulley erosion. Recent reforestation projects further modify slopes.

The experience of recent farmers teaches us two key principles. First, terraces and check dams are made and maintained by small, usually household task-groups (Pérez Rodríguez Reference Pérez Rodríguez2006). Second, because unchecked floodwaters are destructive, a whole drainage segment has to be managed—the hillsides as well as the stream. Therefore, check dams are made in conjunction with contour terraces, beginning at the heads of drainages, not at the midpoint or downstream. These two principles, smallholder labor and whole-drainage management, have implications for social organization.

Investment of labor in landesque capital, that is, investment in long-term material improvements to land (Håkansson and Widgren Reference Håkansson and Widgren2014), apparently began in the Early Formative. A commitment of many cooperating households must have been the key to the Neolithic revolution in this part of Mesoamerica. Why the investment of labor in terracing? With these fertile but erodible soils, erratic rains, and sloping terrain, terracing would be the best way to farm under most conditions of population density or market demand. It was not a technological innovation made reluctantly under conditions of population pressure after a long period of extensive farming (Boserup Reference Boserup1966), but a practical solution for normal risk management, in use almost from the beginning. The agricultural consequence of this commitment was high yield. The population consequence was a positive feedback loop between higher yields and a larger labor force.

Some researchers (Barker Reference Barker2002; Håkansson Reference Håkansson, Håkansson and Widgren2014; Loiske Reference Loiske, Widgren and Sutton2004) have associated landesque capital with world-system demands. The idea is that farmers will not intensify their labor if they do not need cash or there is no external market demand for their output. We are open to considering market demand from the Mesoamerican world-system as one factor promoting landesque capital. The external demands would likely have had to do with the textile sector (cf. Stark et al. Reference Stark, Boxt, Gasco, Lauck, Balkin, Joyce, King, Knight, Kruger, Levine, Lesure, Mendelsohn, Navarro-Castillo, Neff, Ohnersorgen, Pool, Raab, Rosenswig, Venter, Voorhies, Williams and Workinger2016). Nonetheless, it seems probable that most market demand was endogenous, coming from the Mixteca Alta and its nearby trading partners.

Apart from the origin of demand, landesque capital studies have observed regularities in property and land tenure. In general, small farmers will not invest their own labor in land improvements if they do not have some assurance of long-term tenure (Brookfield Reference Brookfield1984). For example, sharecroppers on year-to-year contracts may work hard to sow and reap as much as they can, but they have no interest in picking up stones (Svensson Reference Svensson, Håkansson and Widgren2014). Sixteenth-century wills from Tulancingo in the valley of Coixtlahuaca show that smallholders did have long-term, heritable rights to their fields (van Doesburg Reference van Doesburg and García2004). An implication would be that the tay situndayu (the Mixtec term for landless laborers) would have been a small proportion of the commoner class in places with intensive agricultural terracing. We cannot see the form of property archaeologically, but the intensive rural development is consistent with the historical evidence for smallholder control. Future archaeological study of households could measure relative economic wealth and degree of permanence (Pérez Rodríguez Reference Pérez Rodríguez2006).

Local communities and landesque capital have a long history in Coixtlahuaca. Yet there is a paradox: the population experienced high-amplitude swings of growth and decline, cycles that coincide with demographic rise and decline elsewhere in highland Oaxaca. Periods of great growth and decline are hardly uncommon in the archaeological record in Mesoamerica or on other continents. We are not yet able to account for such cycles at Coixtlahuaca. One factor that could account for the higher amplitude in this broad valley, as opposed to the small valleys, is the positive feedback loop of intensive agriculture—demand—population growth. This loop may have been hard to initiate (as it would be today), but when operating, it could be powerful and self-sustaining. Nevertheless, it was vulnerable to rapid collapse, conceivably from external military force and certainly from an entirely exogenous factor such as European diseases (cf. Brookfield Reference Brookfield1986; Widgren Reference Widgren, Hornborg, McNeill and Martinez-Alier2007).

¿Cómo se Organizaron?

The commitment to landesque capital by smallholders shaped social organization and religion. In sixteenth-century Coixtlahuaca, smallholder households were organized in barrios (sindi in Chocholtec) that controlled and allocated rights to use and inherit fields (van Doesburg Reference van Doesburg and García2004; van Doesburg and Swanton Reference van Doesburg and Swanton2011). Sindi were territorial and participatory, and their lands coincided with a segment of a stream drainage. Territories were marked by shrines or temples. Sindi were corporate in this sense, but there is no evidence that they were corporate descent groups.

Sindi were sections of communities (saçê; Spanish pueblo), the minimal state corresponding to ñuu or altepetl (van Doesburg and Swanton Reference van Doesburg and Swanton2011). The saçê had a territory that corresponded to a drainage basin. That is, barrios were situated along adjacent first-order streams. Communities (saçê) encompassed several of these and included a downstream, second-order reach. This is idealized, but the logic is that the labor and capital in the land were situated in specific stream basins.

A concrete example can be traced along the stream from Tulancingo to Tequixtepec, where each community was in its own basin separated from its neighbors by a divide. The Río Grande de Tulancingo heads at the western end of the valley, and the first community was Tulancingo, consisting of several barrios along the stream and its tributaries. Tulancingo is separated from the next community to the east, Suchixtlahuaca, as the two are in different drainage basins. Down the Río Grande are two smaller communities, Capulalpam and Tepetlapa, each centered on a permanent tributary stream. These two are very small places now, but in the Postclassic each had several barrios. Farther downstream, the Río Grande is joined by two important tributaries at the community of Tequixtepec. Here as elsewhere in the valley, larger towns are on the downstream reaches and smaller ones are upstream. As the Río Grande descends east of Tequixtepec, it flows through narrow valleys and its water is mostly inaccessible for farming. The Tequixtepec border sites (Cerro Dade and Cerro de Enmedio) are at the point where the river drops into a steep and rocky gorge.

In Late Postclassic and probably earlier times, a similar nexus bound together intensive agriculture, smallholders, strong communities, ritual, and institutions analogous to the historic tequio and faena (community collective work service), as Carballo (Reference Carballo and Carballo2013b) notes for central Mexico. Noble lords and ladies, through their marriage alliances, conquests, and other deals, could have holdings in various places, and in this sense the city-state was not necessarily territorial (Hirth Reference Hirth, Sanders, Mastache and Cobean2003; Romero Frizzi Reference Romero Frizzi1996; Terraciano Reference Terraciano2001). But from the point of view of commoners, the saçê was a specific physical space. This tangle of local and cacique interests added fuel to territorial disputes that continued after the colonial period (Dennis Reference Dennis1987; Mendoza García Reference Mendoza García and Traffano2005). The entire valley and some places beyond were drawn together by alliance or conquest in a greater state (curhuña) headed by Coixtlahuaca (van Doesburg and Swanton Reference van Doesburg and Swanton2011). Coixtlahuaca, Tequixtepec, Ihuitlán, and Tulancingo, in that order, were the main centers, followed by tiers of secondary centers (e.g., Suchixtlahuaca, Nativitas) and tertiary centers (e.g., Capulalpam, Nata).

The lienzos show the names and locations of subject towns and barrios, many of which can be identified as specific clusters of archaeological sites. Prehispanic, pre-congregación Otla, Suchixtlahuaca, Nativitas, Tequixtepec, and most of the barrios of Ihuitlán (Brownstone Reference Brownstone2015) are now identifiable on the ground. Other communities seen archaeologically have not yet been identified on lienzos. In some cases, the palaces or temples shown on the lienzos are specific, known archaeological places, as at Coixtlahuaca, Tequixtepec, Nativitas, Otla, and Tulancingo.

Organization tended to be segmentary at all levels. Cities and smaller communities were aggregations of barrios and centralization was weak. We think this was due to the inward-facing, localizing tendencies of the communal landholding units. The noble class tended to segment by descent and marriage alliance, and did not develop much bureaucracy (Lind Reference Lind and Hansen2000). A distinctive feature of government detailed in the Coixtlahuaca lienzos is that the large centers had not one but several ruling lineages. Coixtlahuaca had two major ruling lineages, each with its palace-temple (e.g., Caso Reference Caso1977:1:118–136) on opposite sides of the river about the center of the city. There was a lesser noble palace-temple at the north edge of the city. Tequixtepec likewise was composed of several ruling houses, according to the lienzos and sixteenth-century documents (Rincón Mautner Reference Rincón Mautner2007, Reference Rincón Mautner, Daneels and Mendoza2012; van Doesburg Reference van Doesburg2002, Reference van Doesburg2010; van Doesburg and van Buren Reference van Doesburg and van Buren1997). This feature of multiple ruling lineages in one city closely parallels the earlier description above, showing that the CCA were distributed in multiple places instead of being concentrated in single areas.

Each of these three levels—sindi, saçê, and curhuña—has archaeological correlates. Sindi are clusters of settlement located along drainage segments. Often there are hilltop shrines or temples, or settlements on hills at the edges of the barrio. Saçê are clusters of barrios along the same stream drainage, usually with a few public buildings distributed in the larger barrios. The curhuña is seen archaeologically in the settlement hierarchy of the whole valley. The hierarchy of public buildings by number and size also reflects the organization of the curhuña.

Conclusion

Full-coverage regional survey is an essential step toward understanding local and macroregional processes. The RAC project made improvements in efficiency, data management, and public education over similar previous surveys. It did not achieve all its goals in the extent of area surveyed or quality and richness of information. We recommend that regional survey designs take into account both the improvements we made and the deficiencies of the research design. Many difficulties might be avoided by attending to project management and by building flexibility and capacity into the budget at the proposal stage.

The archaeological record of the Coixtlahuaca valley is enormous. One site on the Río Grande de Ihuitlán extends unbroken for 14 km, and it is not the largest. That distinction belongs to Coixtlahuaca, at 30 km2. The valley of Coixtlahuaca has some of the largest Middle Formative sites reported (one is 13 km2). Artifacts are often abundant. The valley had neither big buildings nor stelae, and even the wealthy and powerful were stuffed into tombs less than a meter in diameter (Bernal 1948–Reference Bernal1949). The real monument of Coixtlahuaca was its completely terraced landscape, a spatially and temporally distributed work that in its aggregate was far larger than the pyramids of Teotihuacan.

The survey provides on-the-ground context for ethnohistorical accounts. Aztec sources (e.g., Durán Reference Durán and Ma1967:2:185) speak of the major international market at Coixtlahuaca. The physical marketplace has not been located, although there are possibilities that might be investigated. A conquest of Coixtlahuaca by Motecuhzoma I was chronicled by the Aztecs (e. g., Códice Chimalpopoca Reference Códice and Velázquez1945:52). Nonetheless, the archaeological imprint of Aztec presence seems minimal (Kowalewski et al. Reference Kowalewski, Pingarrón, Ayala, Steere, Blancas, Vilchis, Zárate, Ortiz, Pluckhahn and Flores2010).

The richest ethnohistorical sources are local and consist of the lienzos and some sixteenth-century texts in archives. Our archaeological survey is in accord with the lienzos, often in specific detail regarding named places, hierarchy, and the segmentary character of the state. There is one important point on which the lienzos are totally silent, and that is the demographic and urban scale of society. This is true of royal dynastic texts elsewhere, too. When one sees the graphic image of lords carrying out a ritual at a place named Tulancingo, one has no idea that it was a city 9 km long, covering the whole Tulancingo valley. The archaeology suggests that 200,000 people was the approximate magnitude of Late Postclassic Coixtlahuaca regional society.

We have described how a population of this size was organized in the Late Postclassic. Key elements of this organization are older. Cross-drainage check dams dated to 1500 BC indicate an early age for the social commitment to terrace systems. Investment in landesque capital increased in the Middle Formative, when we also see local communities centered on drainage basins and shrines or temples at the boundaries of territories. The pattern of few, small, and widely distributed rather than centrally concentrated civic-ceremonial buildings began in the Middle Formative. The city-state seems to have been present in the Early Classic, but almost nothing is known about political organization above the level of the local community in the Middle Formative. In this “moment” of Mixteca Alta society, local communities organize themselves.

Important structural features have persisted over the longue durée: the strong linkage between smallholders and intensive terrace agriculture; cooperating, territorially based barrios and local communities; localist religion; and resistance to centralizing authority. These persistent structural features are maintained through collective action drawing on internally generated resources (Blanton and Fargher Reference Blanton and Fargher2008).

Persistence of the collective community does not translate into collective action for society as a whole. The state had greater access to external resources, supra-local authority, and military power. Kings employed aggrandizing, individualizing network strategies; they appropriated land and people (well attested in the sixteenth century as the system was collapsing, e.g., Spores Reference Spores2007; Terraciano Reference Terraciano2001). This was the moment of Mixteca Alta society emphasized by Fargher et al. (Reference Fargher, Espinoza and Blanton2011).

Society as a whole is neither self-organized nor organized by rulers. Mutually dependent, competing classes have distinct interests and strategies. In the Mixteca Alta the dialectic between rulers and the collective agency of commoners was itself a persistent structural feature, and this case is not unique. Balinese history displays a similar struggle between rulers with external resources and communities that generated internal resources through a self-governing agroecosystem (Covarrubias Reference Covarrubias and Knopf1956; Geertz Reference Geertz1980; Lansing Reference Lansing1995). Returning to the question asked by Coixtlahuacans about how people were organized in the past, and in light of what we have learned, we observe that the problems and strategies, although not identical to those of today, were sufficiently similar as to make the answers interesting.

Acknowledgments

The 2011 RAC project was supported by the National Science Foundation and the Fundación Harp Helú, with permission of the Instituto Nacional de Antropología e Historia (INAH) and the helpful actions of the Centro INAH Oaxaca. We thank Agustín Andrade Cuautle, Alberto Bazán Hernández, Leonardo Bazán Velasco, Luis Cruz Lara, Sebastián van Doesburg, Fernando Juárez, Gustavo Salazar, Ron Spores, Marijke Stoll, Mark Williams, Marc Winter, four reviewers, and hundreds of other people for their assistance. Many people taught us about how soil and water can be managed and how agricultural practices are embedded in society and tradition, but in particular we credit the expertise of Baldemar García Lara, Guillermo Pérez Jerónimo, and Gil Heriberto Santiago Cruz.

Data Availability Statement

Artifacts are curated by the Instituto Nacional de Antropología e Historia at the Convento San Juan Bautista Coixtlahuaca. Data are available from Stephen A. Kowalewski, Laboratory of Archaeology, Department of Anthropology, University of Georgia.

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Figure 0

Figure 1. Location of Coixtlahuaca and surrounding places mentioned in the text.

Figure 1

Table 1. Chronology, Sites, and Total Site Area for the Valley of Coixtlahuaca.

Figure 2

Figure 2. Late Cruz (700–300 BC) settlements in the valley of Coixtlahuaca. The black line shows the survey area. The edges of the gray shading indicate the 2,100 m and 24,00 m asl contours. The three known Middle Cruz sites are marked by x’s.

Figure 3

Figure 3. Ramos (300 BC–AD 200) settlements in the valley of Coixtlahuaca.

Figure 4

Figure 4. Early Las Flores (AD 200–600) settlements in the valley of Coixtlahuaca.

Figure 5

Figure 5. Surface collections having metálica or false plumbate, a possible Early Postclassic marker.

Figure 6

Figure 6. Late Natividad (AD 1200–1520) settlements in the valley of Coixtlahuaca.

Figure 7

Figure 7. Distribution of Late Postclassic platform mounds for civic-ceremonial buildings, by size class, with outlines of Late Postclassic settlements. Numbers refer to number of mounds in a size class in a group at a specific place. Groups are indicated by numbers greater than one and by strings separated by commas. Platform size classes: largest have top areas > 200 m2, shown with a number in the largest font size; medium have top areas < 200 m and top lengths > 10 m, shown with a number in medium-size italic font; and small have tops with no dimension > 10 m but are considered to be public buildings, shown with number in smallest font. Positions of numbers approximate locations. For example, in the center of Coixtlahuaca is a group of 4 large, 5 medium, and 4 small platforms. Cerro Zapotal, southeast of Coixtlahuaca, has 3 small mounds at 3 different places.