PM2-Eastern Coahuila (Cretaceous of Mexico)

Where: Coahuila, Mexico (27.0° N, 102.0° W: paleocoordinates 24.3° N, 54.7° W)

• small collection-level geographic resolution

When: Menchaca Limestone Member, Valanginian (139.8 - 132.9 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

• dk. blue-black limestone in beds averaging 18 inches in thickness, the lower part contains white calcite replaced Exogyras, namely E. reedi and E. putnami

Preservation: replaced with calcite

Primary reference: R. W. Imlay. 1940. Neocomian Faunas of Northern Mexico. Geological Society America Bulletin 51(1):117-190 [M. Patzkowsky/K. Layou/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 2149: authorized by Mark Patzkowsky, entered by Karen Layou on 23.06.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Gryphaeidae
Exogyra reedi Imlay 1937 oyster
"Exogyra putnami" = Aetostreon subsinuatum Leymerie 1842 oyster