Where: Somervell County, Texas (32.3° N, 97.7° W: paleocoordinates 29.9° N, 55.5° W)

• coordinate based on political unit

• 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.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithology not reported and packstone

Size class: macrofossils

Primary reference: E. Cadena. 2015. The first South American sandownid turtle from the Lower Cretaceous of Colombia. PeerJ 3:e1431:1-24 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 180949: authorized by Patricia Holroyd, entered by Patricia Holroyd on 09.08.2016

Creative Commons license: CC BY (attribution)