USGS M8691 (Cretaceous of the United States)

Where: Medina County, Texas (29.4° N, 99.3° W: paleocoordinates 34.9° N, 72.6° W)

• small collection-level geographic resolution

When: Baculites maclearni ammonoid zone, Anacacho Limestone Formation, Middle Campanian (83.5 - 70.6 Ma)

• Swezey and Sullivan (2004) correlate this bed to the Baculites maclearni zone., which is middle Campanian in Gradstein et al., 2004.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; calcareous shale

Size class: mesofossils

Reposited in the USGS

Primary reference: W. P. Elder. 1996. Bivalves and Gastropods from the Middle Campanian Anacacho Limestone, south central Texas. Journal of Paleontology 70(2):247-271 [M. Patzkowsky/K. Layou/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 3601: authorized by Mark Patzkowsky, entered by Karen Layou on 05.08.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

? Cardiid indet.
originally entered as "?Cardiid indet."
 Ostreida - Gryphaeidae
 Hiatellida - Hiatellidae
Panopea anacachoensis n. sp. clam
originally entered as "Panopea anacachoensis n. sp."
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite