Also known as IGM-2779
Where: Coahuila, Mexico (26.0° N, 101.0° W: paleocoordinates 31.7° N, 82.8° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Rancho Nuevo Formation (Difunta Group), Early/Lower Paleocene (66.0 - 61.7 Ma)
• Fossils obtained from the Rancho Nuevo Formation suggest an early Tertiary (Midway Fm-equivalent) age, equivalent to Kincaid-lower Wells Point, Clayton-lower Porters Creek, and lower Velasco units on the Gulf coastal plain.
• bed-level stratigraphic resolution
Environment/lithology: marginal marine; lithified, concretionary, gray, green, sandy siltstone
Size class: macrofossils
Collection methods: quarrying,
• Studied material is deposited in the Museo de Paleontologia of the Instituto de Geologia, Universidad Nacional Autonoma de Mexico. Types are in the type collection and classified under the acronym IGM. The type locality is registered in the locality catalogue of the Museo de Paleontogia.
Primary reference: F. J. Vega and M.D.C. Perrilliat. 1995. On some Paleocene invertebrates from the Potrerillos Formation (Difunta Group), northeastern Mexico. Journal of Paleontology 69(5):863-869 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 42471: authorized by Austin Hendy, entered by Austin Hendy on 29.07.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Sedentaria | |
Rotularia (Rotularia) dickhauti White 1881 | |
Cephalopoda | |
Cimomia haltomi Aldrich 1931 | |
Bivalvia | |
Venericardia (Baluchicardia) francescae Gardner and Bowles 1939 clam |