ammonites
Cerro Blanco, NMMNH L-918 (Triassic of the United States)

Also known as Typothorax type, Gallina, Wheeler Expedition

Where: Rio Arriba County, New Mexico (35.3° N, 106.8° W: paleocoordinates 10.8° N, 45.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Petrified Forest Member (Chinle Formation), Norian (221.5 - 205.6 Ma)

• also Painted Desert Mb., Petrified Forest Fm., Chinle Gp.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; flat-pebble, green, red, calcareous conglomerate and green, red, calcareous sandstone

• "sandstone and clay-pebble conglomerate: dusky red (5 R 3/4) to moderate yellow green (5 GY 7/4); sandstone is same lithology as unit 3; very calcareous; conglomerate clasts are calcrete, highly calcareous; conglomerate has crude trough crossbeds..."

Size class: macrofossils

Collected by E. D. Cope in 1874; reposited in the NMMNH, USNM

• Cope accompanied Wheeler Expedition

Primary reference: E. D. Cope. 1875. The geology of New Mexico. Proceedings of the Academy of Natural Sciences of Philadelphia 27:263-269 [M. Carrano/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 80925: authorized by Matt Carrano, entered by Matt Carrano on 21.05.2008, edited by Richard Butler