West of Tom Nunn ranch (Cretaceous of the United States)

Where: Uvalde County, Texas (29.1° N, 100.0° W: paleocoordinates 34.7° N, 72.7° W)

• coordinate based on nearby landmark

• hand sample-level geographic resolution

When: Anacacho Formation, Campanian (83.6 - 72.1 Ma)

• Ammonite distributions suggest that at least two time intervals are represented by the Anacacho in the type area and probably elsewhere; a lower Campanian and a middle Campanian interval. The stratigraphic position of this collection is unknown.

• group of beds-level stratigraphic resolution

Environment/lithology: perireef or subreef; lithified, shelly/skeletal limestone

• Most fossiliferous parts of the Anacacho Limestone are reefal to lagoonal facies developed around volcanic cones
• The Anacacho is mainly composed of bioclastic and argillaceous limestones with subsidiary clay and marl interbeds. Lithified based on outcrop photos.

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Primary reference: G. A. Cooper. 1973. Fossil and recent Cancellothyridacea (Brachiopoda). Tohoku University, Science Reports, 2nd Series (Geology), Special Volume 6:371-390 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 190356: authorized by Matthew Clapham, entered by Matthew Clapham on 05.12.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Terebratulida - Cancellothyrididae