Where: Mexico (30.4° N, 111.9° W: paleocoordinates 4.3° S, 102.8° W)
When: Buelna Formation (Bonnia-Olenellus Group), Dyeran (515.3 - 511.2 Ma)
• All lithology/stratigraphic details are based primarily on exposures of rocks in the Cerro Rajon area. Unit is 77.5m thick. Formation creates a conspicuous ridge or ledge in most areas. The broad facies included in the formation and a lack of information regarding the lithology containing the fossils prevents a single paleoenvironment from being selected.
• group of beds-level stratigraphic resolution
Environment/lithology: lithified, gray, green, yellow siltstone and lithified, brown, yellow sandstone
Size classes: macrofossils, mesofossils
Preservation: trace, original calcite
Collection methods: bulk,
Primary reference: J. Stewart, M. A. S. McMenamin, and J. M. Morales-Ramirez. 1984. Upper Proterozoic and Cambrian rocks in the Caborca Region, Sonora, Mexico - physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations. U. S. Geological Survey Professional Papers (1309)1-33 [M. Patzkowsky/P. Borkow]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 10684: authorized by Mark Patzkowsky, entered by Phil Borkow on 11.06.2001
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Salterella | |
Salterella sp. Billings 1861 | |
Salterella maccullochi | |
Salterella maccullochi Murchison 1859 | |
Salterella pulchella | |
Salterella cf. pulchella Billings 1861 | |
Archaeocyatha | |
Coscinocyathus sp. Bornemann 1884 archaeocyath sponge | |
Protopharetra sp. Bornemann 1884 archaeocyath sponge | |
Tergomya | |
Scenella cf. reticulata Billings 1872 | |
Hyolitha | |
"Hyolithes whitei" = Nevadotheca whitei, Hyolithes sp.
"Hyolithes whitei" = Nevadotheca whitei Resser 1938
Hyolithes sp. d'Eichwald 1840 | |
Orthotheca buelna Lochman 1952 | |
Paterinata | |
Paterina sp. Beecher 1891 | |
Trilobita | |
Olenelloidea indet. Walcott 1890 trilobite | |
"Olenellus fremonti" = Mesonacis fremonti, Olenellus puertoblancoensis
"Olenellus fremonti" = Mesonacis fremonti Walcott 1910 trilobite
Olenellus puertoblancoensis Lochman 1952 trilobite | |
Wanneria sp. Walcott 1910 trilobite
Wanneria walcottana Wanner 1901 trilobite | |
Antagmus buttsi, Antagmus solitarius, Onchocephalus buelnaensis, Onchocephalus mexicanus, Sombrerella mexicana
Antagmus buttsi Resser 1939 trilobite
Antagmus solitarius Lochman 1952 trilobite
Onchocephalus buelnaensis Lochman 1952 trilobite
Onchocephalus mexicanus Lochman 1952 trilobite
Sombrerella mexicana Lochman 1948 trilobite | |
Bonnia sonora Lochman 1952 trilobite | |
Hormogoneae | |
Girvanella sp. Nicholson and Etheridge 1878
Girvanella mexicana Cooper et al. 1952 | |
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