southwestern flanks of Hen Egg Mountain (Cretaceous to of the United States)

Also known as TMM 43343, Big Bend NP

Where: Brewster County, Texas (29.4° N, 103.5° W: paleocoordinates 33.6° N, 73.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Pen Formation (Terlingua Group), Middle Santonian to Middle Santonian (85.8 - 83.5 Ma)

• Unknown position within the Pen Formation but assigned an age of middle to late Santonian on the basis of calcareous nanofossils.

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone

Size class: macrofossils

Primary reference: G. L. Bell Jr., K. R. Barnes, and M. J. Polcyn. 2013. Late Cretaceous mosasauroids (Reptilia, Squamata) of the Big bend region in Texas, USA. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 103:571-581 [P. Mannion/J. Tennant/F. Aspromonte]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 151427: authorized by Philip Mannion, entered by Jonathan Tennant on 01.10.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Squamata - Mosasauridae
Ectenosaurus sp. Russell 1967 mosasaur
SMU76350
Clidastes liodontus Merriam 1894 mosasaur
TMM 43343-1, complete skull and vertebrae