Middle Park (USNM 218) (Jurassic to of the United States)

Also known as Antrodemus type site

Where: Grand County, Colorado (40.1° N, 105.9° W: paleocoordinates 36.5° N, 52.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Morrison Formation, Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: pond; lithology not reported

Size class: macrofossils

Collected by F. V. Hayden in 1869; reposited in the USNM

Collection methods: surface (float),

Primary reference: J. Leidy. 1870. [Remarks on Poikilopleuron valens, Clidastes intermedius, Macrosaurus proriger, Baptemys wyomingensis, and Emys stevensonianus]. Proceedings of the Academy of Natural Sciences of Philadelphia 22(1):3-5 [M. Carrano/M. Carrano/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 52872: authorized by Matthew Carrano, entered by Matthew Carrano on 25.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Avetheropoda - Allosauridae
"Poicilopleuron valens n. sp." = Allosaurus fragilis
"Poicilopleuron valens n. sp." = Allosaurus fragilis Marsh 1877 allosaurid
USNM 218