En este trabajo se presentan los resultados de los análisis de isótopos estables (δ13Ccol, δ15Ncol, δ13Capa y δ18Oapa) realizados en huesos de camélidos de sitios de Puripica, Tulán y Salar de Punta Negra (Región de Antofagasta, Chile), dentro de una secuencia que abarca desde el Arcaico temprano hasta el Formativo temprano. Estos datos se cotejaron con datos osteométricos y genéticos de camélidos silvestres y domésticos con el objetivo de comprender el uso de los espacios de caza y pastoreo. Los resultados correspondientes a las muestras de los periodos Arcaico temprano y medio (10.000-5300 aP) obedecen a las características ambientales registradas durante dicho lapso temporal en el área. Para el Arcaico tardío (5300-4000 aP) y el Formativo temprano (3100-2400 aP) se observa una distribución de valores isotópicos relativamente similar. Sin embargo, debido a la alta variabilidad de tamaños dentro de los camélidos domésticos, no es posible definir el uso de ciertas áreas de pastura sobre otras. Al mismo tiempo, los valores isotópicos de carbono y nitrógeno de la fase Tarajne (3700-3200 aP) se muestran poco variables, patrón que se explica por el uso de áreas acotadas para la caza de animales silvestres y/o el pastoreo de animales domésticos.

We investigated foodways at Real Alto, an early Formative (4400–1800 BC) Valdivia site in coastal Ecuador, using starch and phytoliths recovered from 50 stone tools from three residential and two ceremonial structures, as well as 46 human dental calculus samples, to explore how food reflects the social relationships and economy of the community. Maize was important in daily meals and ceremonial foods by the Middle Valdivia (2800–2400 BC), but it was only one component of an agricultural system that included yuca, arrowroot, llerén, canna, yam, jackbean, squash, gourd, chili, and cotton. Ceremonial and everyday foods at Real Alto did not differ: actions surrounding food were both domestic and ceremonial, depending on context. Households had equal access to annual crops and to root-tubers with longer growing seasons. Gelatinized starch was commonly recovered on tools, indicating the processing of cooked foods. Dental calculus residues confirmed common consumption of cooked foods, fruits, and root-tubers. Cultivating crops with different water and growing season requirements necessitated diverse practices, potentially including selection of short-season varieties, hand watering, and growing crops over multiple rainy seasons. The latter two practices required increased labor inputs: access to labor was likely a key element supporting the nascent social hierarchy that emerged by the Middle Valdivia.

This article presents a combined pollen and phytolith record of a 1.70-m sediment core from the wetlands of India Muerta (33° 42′ S, 53° 57′ W) in the lowland Pampa (grasslands) of southeastern Uruguay. Six 14C dates and the pollen and phytolith content of the samples permitted the recognition of four distinct climatic periods between 14,850 14C yr B.P. and the present. The Late Pleistocene period (between ca. 14,810 and ca. 10,000 14C yr B.P.) was characterized by drier and cooler conditions indicated by the presence of a C3-dominated grassland. These conditions prevailed until the onset of the warmer and more humid climate of the Holocene around 9450 14C yr B.P. The early Holocene (between around 10,000 and 6620 14C yr B.P.) was characterized by the establishment of wetlands in the region as evidenced by the formation of black peat, the increase in wetland taxa, and the replacement of C3 Pooideae by C4 Panicoideae grasses. During the mid-Holocene, around 6620 14C yr B.P., began a period of environmental change characterized by drier climatic conditions, which resulted in the expansion of halophytic communities in the flat, low-lying areas of the wetlands of India Muerta. About 4020 14C yr B.P. a massive spike of Amaranthaceae/Chenopodiaceae coupled with a radical drop in wetland species indicates another major and more severe period of dryness. After ca. 4000 14C yr B.P., a decrease of halophytic species indicates the onset of more humid and stable climatic conditions, which characterized the late Holocene.

The findings reported in this article substantially improve our knowledge of the late Glacial and Holocene climate and vegetation in the region. The data provide a detailed record of the timing and severity of mid-Holocene environmental changes in southeastern South America. Significantly, the mid-Holocene drying trend coincided with major organizational changes in settlement, subsistence, and technology of the pre-Hispanic populations in the region, which gave rise to early Formative societies. This study also represents the first combined pollen and phytolith record for southeastern South America reinforcing the utility of phytoliths as significant indicators of long-term grassland dynamics.

In this ground-breaking study the author looks at three consecutive styles of rock art, placing them in the social context in which they were produced. Although necessarily succinct, the argument shows that as hierarchy increased and functioned over longer distances, rock art could perform as the organ of pastoralist authority, or the badge of marginalised hunters or, most often, as the imagery of consensus masking social inequality.