Where: Blanco County, Texas (30.1° N, 98.4° W: paleocoordinates 28.0° N, 56.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• 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: marine; limestone

Size class: macrofossils

Collected by Perkins in 1958; reposited in the TMM

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: taxonomic analysis

PaleoDB collection 52046: authorized by Matthew Carrano, entered by Matthew Carrano on 13.07.2005

Creative Commons license: CC BY (attribution)