Where: Oaxaca, Mexico (17.6° N, 97.1° W: paleocoordinates 15.2° S, 49.8° W)
• coordinate stated in text
When: Ixtaltepec Formation, Pennsylvanian (323.2 - 298.9 Ma)
• bivalves allow a tentative age assignment that ranges from Morrowan to Desmoinesian
Environment/lithology: offshore; gray shale
Size class: macrofossils
• bryozoans, brachiopods, bivalves, trilobites, crinoids
•(in general - argilliceous unit: bivalve species are associated with delicate branched or laminar bryozoan colonies, trilobites, crinoids, corals, ophiuroids, gastropods, and spiriferid, strophomenid, and inarticulate brachiopods)
Preservation: mold/impression
Primary reference: S.A. Quiroz-Barroso and M. del Carmen Perrilliat. 1998. Pennsylvanian Bivalves from the Ixtaltepec Formation, Mexico. Journal of Paleontology 72(6):1011-1024 [B. Seuss/B. Seuss]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 211812: authorized by Barbara Seuss, entered by Barbara Seuss on 28.07.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Crinoidea | |
Crinoidea indet. Miller 1821 Sea lily | |
Bivalvia | |
Bivalvia indet. Linnaeus 1758 clam | |
Aviculopecten "sp. B" M'Coy 1851 scallop
Aviculopecten cf. basilicus Newell 1938 scallop | |
Streblopteria sp. McCoy 1851 scallop | |
Edmondia ovata Meek and Worthen 1873 clam | |
Permophorus cf. oblongus Meek and Hayden 1872 clam |