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)

• 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: J. G. Pittman. 1989. Stratigraphy, lithology, depositional environment, and track type of dinosaur track-bearing beds of the Gulf Coastal Plain. In D. D. Gillette and M. G. Lockley (eds.), Dinosaur Tracks and Traces. Cambridge University Press, Cambridge 135-153 [M. Carrano/K. Maguire/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52338: authorized by Matthew Carrano, entered by Kaitlin Maguire on 03.08.2005

Creative Commons license: CC BY (attribution)