Where: Williamson County, Texas (30.6° N, 97.7° W: paleocoordinates 28.3° N, 56.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Upper Member (Glen Rose Limestone Formation), Early/Lower Albian (112.0 - 109.0 Ma)

• on upper surface of Glen Rose Fm.

•The Glen Rose formation spans through four ammonite zones with ages between latest Aptian and early Albian. Young 1974 suggested the Kasanskyella spathi ammonite zone is latest aptian, the Hypacanthoplites cragini zone is earliest Albian, the Douvilleiceras mammillatum and Hypacanthoplites comalensis zones are early Albian and may extend into the middle Albian. The Salenia texana Zone and Corbula bed fall within the mammillatum zone. The benthic foraminifera Orbitolina texana also suggests a late aptian - early albian age and is found in basal levels and in the upper member (Stricklin et al. 1971). Scott et al. (2007) estimated that the age of the Glen Rose Formation ranges from 113.3 to 108.0 Ma.

• bed-level stratigraphic resolution

Environment/lithology: peritidal; dolomitic lime mudstone and mudstone

Size class: macrofossils

Preservation: mold/impression, trace

Reposited in the TMM

Collection methods: surface (in situ),

Primary reference: W. Langston. 1974. Nonmammalian Comanchean tetrapods. In B. F. Perkins (ed.), Aspects of Trinity Division Geology. A Symposium on the Stratigraphy, Sedimentary Environments, and Fauna of the Comanche Cretaceous Trinity Division (Aptian and Albian) of Texas and Northern Mexico. Geoscience and Man 8:77-102 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52339: authorized by Matthew Carrano, entered by Kaitlin Maguire on 03.08.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)