Chaco Cañon Aspideretes singularis Type Locality (Paleocene of the United States)

Where: San Juan County, New Mexico (36.1° N, 108.0° W: paleocoordinates 43.0° N, 87.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Nacimiento Formation, Puercan (66.0 - 63.3 Ma)

• "the Torrejon beds, the upper division of the Puerco formation, of the Basal Eocene" = Nacimiento Formation

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

• none given

Size class: macrofossils

Collected by David Baldwin in 1883; reposited in the AMNH

• collected for E. D. Cope

Primary reference: O. P. Hay. 1907. Descriptions of seven new species of turtles from the Tertiary of the United States. Bulletin of the American Museum of Natural History 23(34):847-863 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 74549: authorized by John Alroy, entered by John Alroy on 12.08.2007, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Testudines - Trionychidae
"Aspideretes singularis n. sp." = Trionyx singularis
"Aspideretes singularis n. sp." = Trionyx singularis Hay 1907 softshell turtle
Mammalia
 Procreodi - Arctocyonidae
Arctocyon ferox
Arctocyon ferox Cope 1883 condylarth
said to be collected by Baldwin in 1882, so possibly a different locality