Where: Coahuila, Mexico (26.1° N, 100.8° W: paleocoordinates 31.7° N, 82.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Upper Mudstone Member (Potrerillos Formation), Early/Lower Paleocene (66.0 - 61.7 Ma)

• The Potrerillos Formation was subdivided into five members by McBride (1974), of which the collection is from the second highest, Upper Mudstone Member. Foraminifera in the lower members indicate a Maastrichtian age, while fossils in the upper members indicate a Paleocene age. At IGM 2778 a coarse calcarenite bed of light gray color occurs, nearly 2 m thick. Fossil remains are abundant and include transported remains of corals, gastropods, bivalves, shark teeth, and bone fragments.

• bed-level stratigraphic resolution

Environment/lithology: shoreface; lithified, coarse-grained, shelly/skeletal, gray grainstone

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 42469: authorized by Austin Hendy, entered by Austin Hendy on 29.07.2004

Creative Commons license: CC BY (attribution)