Where: Texas (29.8° N, 98.7° W: paleocoordinates 27.7° N, 57.2° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: 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.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, red claystone and lithified, shelly/skeletal limestone

Size class: macrofossils

Preservation: original calcite

Primary reference: R. E. Peck and W.T. Watkins. 1972. Comatulid crinoids from the Lower Cretaceous of Texas. Journal of Paleontology 46(3):410-414 [S. Holland/S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37835: authorized by Steven Holland, entered by Steven Holland on 25.03.2004

Creative Commons license: CC BY (attribution)