west bank, Seco Creek (TMM 42996) (Cretaceous of the United States)

Where: Medina County, Texas (29.6° N, 99.4° W: paleocoordinates 27.7° N, 57.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• top of Unit 1, middle Glen Rose Limestone

•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; lime mudstone

• Tracks found atop a limestone stratum in the bed of the creek. "Carbonate mud flat"

Size class: macrofossils

Preservation: mold/impression, trace

Collected by F. Stricklin; reposited in the TMM

Collection methods: surface (in situ),

• Identification: Stricklin and Amsbury (1974)

Primary reference: F. L. Stricklin and D. L. Amsbury. 1974. Depositional environments on a low-relief carbonate shelf, middle Glen Rose Limestone, central Texas. 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 8:53-66 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52146: authorized by Matthew Carrano, entered by Kaitlin Maguire on 27.07.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• "possibly of a pterosaur"
Reptilia
 Theropoda -
 Pterosauria -
? Pterosauria indet. pterosaur
Tracks, wing-tip scratch marks
 Loricata -
Crocodylia indet. crocodilian