Where: Comal County, Texas (29.9° N, 98.3° W: paleocoordinates 27.8° N, 56.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

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

• Arctica roemeri beds about 200 feet above the base of Glen Rose

•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.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified limestone

Size class: macrofossils

Primary reference: J. W. Wells. 1932. Corals of the Trinity Group of the Comanchean of central Texas. Journal of Paleontology 6(3):225-256 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 74765: authorized by Wolfgang Kiessling, entered by Uta Merkel on 29.08.2007

Creative Commons license: CC BY (attribution)