Where: Medina County, Texas (29.3° N, 99.1° W: paleocoordinates 34.9° N, 72.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Bostrychoceras polyplocum zone; was originally entered as Middle Campanian. Comment by J. Sessa: Swezey and Sullivan (2004) correlate this bed to the Baculites maclearni zone., which is middle Campanian in Gradstein et al., 2004. Also, Bostrychoceras polyplocum zone spans almost the entire middle Campanian and part of the upper Campanian, thus I have changed the interval back to middle Campanian.

• bed-level stratigraphic resolution

Environment/lithology: marine; limestone

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 3607: authorized by Mark Patzkowsky, entered by Karen Layou on 05.08.1999

Creative Commons license: CC BY (attribution)