Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-24T06:31:30.187Z Has data issue: false hasContentIssue false
  • English
  • Français

Notchpeakia, a new genus of Upper Cambrian (Sunwaptan) “entomaspidid” trilobites

Published online by Cambridge University Press:  14 July 2015

Jonathan M. Adrain  and
Stephen R. Westrop
Jonathan M. Adrain
Affiliation:
Department of Geoscience, University of Iowa, 121 Trowbridge Hall, Iowa City 52242,
Stephen R. Westrop
Affiliation:
Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, 2401 Chautauqua Avenue, Norman 73072,
Get access Rights & Permissions [Opens in a new window]

Abstract

Trilobites previously assigned to the Entomaspididae Ulrich in Bridge, 1931 are common in Laurentian strata assigned to the upper Sunwaptan Stage of the Upper Cambrian. Most species are poorly known, and typically only sparse cranidial data are available. Large silicified samples from the Lava Dam Member of the Notch Peak Formation, western Utah, contain three new species for which cranidia, librigenae, thoracic segments, and pygidia are known. the species permit clarification of the morphology and affinities of previously described taxa from elsewhere. They are referred to Notchpeakia n. gen. (type species: N. milleri n. sp.) which, in addition to the type includes N. taylori n. sp., N. notchpeakensis n. sp., N. cherrycreekensis n. sp., and N. varga (Westrop, 1986). the “entomaspidid” trilobites are assigned to the traditionally post-Cambrian Harpetidae Hawle and Corda, 1847.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 6 , November 2006 , pp. 1152 - 1171
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Adrain, J. M., and Westrop, S. R. 2004. A Late Cambrian (Sunwaptan) silicified trilobite fauna from Nevada. Bulletins of American Paleontology, 365, 51 p.Google Scholar
Adrain, J. M., and Westrop, S. R. 2005. Late Cambrian ptychaspidid trilobites from western Utah: Implications for trilobite systematics and biostratigraphy. Geological Magazine, 142:377–398.CrossRefGoogle Scholar
Bridge, J. 1931. Geology of the Eminence and Cardareva quadrangles. Missouri Bureau of Geology and Mines, second series, 24:1–228. (For 1930) Google Scholar
Chatterton, B. D. E., and Ludvigsen, R. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River area, District of Mackenzie, Canada. Palaeontographica Abteilung A, 154:1–106.Google Scholar
Ebach, M. C., and McNamara, K. J. 2002. A systematic revision of the family Harpetidae (Trilobita). Records of the Western Australian Museum, 21:235–267.CrossRefGoogle Scholar
Fortey, R. A. 1983. Cambrian–Ordovician trilobites from the boundary beds in western Newfoundland and their phylogenetic significance. Special Papers in Palaeontology, 30:179–211.Google Scholar
Gilman Clark, M., and Shaw, A. B. 1968. Paleontology of northwestern Vermont XVI. Trilobites of the Upper Cambrian Gorge Formation (upper bed 3). Journal of Paleontology, 42:1014–1026.Google Scholar
Hawle, I., and Corda, A. J. C. 1847. Prodrom einer Monographie der Böhmischen Trilobiten. J. G. Calve, Prague, 176 p.Google Scholar
Hintze, L. F., Taylor, M. E., and Miller, J. F. 1988. Upper Cambrian–Lower Ordovician Notch Peak Formation in western Utah. United States Geological Survey Professional Paper, 1393, 30 p.Google Scholar
Hupé, P. 1953. Classe des Trilobites, p. 44–246. In Piveteau, J. (ed.), Traité de Paléontologie. Tome 3. Les Formes Ultimes d'Invertébrés. Morphologie et Évolution. Onycophores. Arthropodes. Échinoderms. Stomocordés. Masson et Cie, Paris.Google Scholar
Hupé, P. 1955. Classification des Trilobites. Annales de Paléontologie, 41:111–345.Google Scholar
Jell, P. A., and Adrain, J. M. 2003. Available generic names for trilobites. Memoirs of the Queensland Museum, 48:331–553.Google Scholar
Kindle, C. H. 1982. The C.H. Kindle Collection: Middle Cambrian to Lower Ordovician trilobites from the Cow Head Group, western Newfoundland. Geological Survey of Canada Paper, 82-1C:1–17.Google Scholar
Loch, J. D., Stitt, J. H., and Derby, J. R. 1993. Cambrian–Ordovician boundary interval extinctions: Implications of revised trilobite and brachiopod data from Mount Wilson, Alberta, Canada. Journal of Paleontology, 67:497–517.CrossRefGoogle Scholar
Ludvigsen, R. 1982. Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, western District of Mackenzie. Royal Ontario Museum Life Sciences Contributions, 134:1–188.Google Scholar
Ludvigsen, R., Westrop, S. R., and Kindle, C. H. 1989. Sunwaptan (Upper Cambrian) trilobites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana, 6:1–175.Google Scholar
Miller, J. F., Evans, K. R., Loch, J. D., Ethington, R. L., and Stitt, J. H. 2001. New lithostratigraphic units in the Notch Peak and House formations (Cambrian–Ordovician), Ibex area, western Millard County, Utah. Brigham Young University Geology Studies, 46:35–69.Google Scholar
Rasetti, F. 1944. Upper Cambrian trilobites from the Lévis Conglomerate. Journal of Paleontology, 18:229–258.Google Scholar
Rasetti, F. 1952. Cephalic sutures in the Upper Cambrian trilobite Entomaspis . Journal of Paleontology, 26:797–802.Google Scholar
Rasetti, F. 1959. Trempealeauian trilobites from the Conococheague, Frederick and Grove limestones of the central Appalachians. Journal of Paleontology, 33:375–399.Google Scholar
Rasetti, F. 1961. Dresbachian and Franconian trilobites of the Conococheague and Frederick limestones of the central Appalachians. Journal of Paleontology, 35:104–124.Google Scholar
Raymond, P. E. 1937. Upper Cambrian and Lower Ordovician Trilobita and Ostracoda from Vermont. Geological Society of America Bulletin, 48:1079–1146.CrossRefGoogle Scholar
Ross, R. J. Jr. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Peabody Museum of Natural History, Yale University, Bulletin, 6:1–161.Google Scholar
Stitt, J. H. 1971. Late Cambrian and earliest Ordovician trilobites, Timbered Hills and lower Arbuckle groups, western Arbuckle Mountains, Murray County, Oklahoma. Oklahoma Geological Survey Bulletin, 110:1–83.Google Scholar
Stubblefield, C. J. 1959. Evolution in trilobites. An address to the Geological Society of London at its anniversary meeting on 29 April 1959. Quarterly Journal of the Geological Society of London, 115:145–162.CrossRefGoogle Scholar
Taylor, M. E., and Halley, R. B. 1974. Systematics, environment and biogeography of some Late Cambrian and Early Ordovician trilobites from eastern New York State. United States Geological Survey Professional Paper, 834:1–38.Google Scholar
Walcott, C. D. 1925. Cambrian geology and paleontology, V. No. 3-Cambrian and Lower Ozarkian trilobites. Smithsonian Miscellaneous Collections, 75(3):61–146.Google Scholar
Westrop, S. R. 1986. Trilobites of the Upper Cambrian Sunwaptan Stage, southern Canadian Rocky Mountains, Alberta. Palaeontographica Canadiana, 3:1–179.Google Scholar
Westrop, S. R. 1995. Sunwaptan and Ibexian (Upper Cambrian–Lower Ordovician) trilobites of the Rabbitkettle Formation, Mountain River region, northern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana, 12:1–75.Google Scholar
Whittington, H. B. 1981. Paedomorphosis and cryptogenesis in trilobites. Geological Magazine, 118:591–602.CrossRefGoogle Scholar
Wiley, E. O. 1981. Phylogenetics: The Theory and Practice of Phylogenetic Systematics. Wiley, New York, 456 p.Google Scholar
Winston, D., and Nicholls, H. 1967. Late Cambrian and early Ordovician faunas from the Wilberns Formation of central Texas. Journal of Paleontology, 41:66–96.Google Scholar