Harding Formation Trilobites (Ordovician of the United States)

Where: Fremont County, Colorado (38.0° N, 105.0° W: paleocoordinates 14.9° S, 74.0° W)

• local area-level geographic resolution

When: Harding Formation, Caradoc (458.4 - 449.5 Ma)

• Stratigraphy from "Harding and Fremont Formations, Colorado" Sweet 1954.

• formation-level stratigraphic resolution

Environment/lithology: marine; silty shale

• Environments from S. Holland
• lower silty shale in basal 30 feet of Harding Formation

Size class: macrofossils

Primary reference: E. A. Frederickson and J. M. Pollack. 1952. Two Trilobite Genera from the Harding Formation (Ordovician) of Colorado. Journal of Paleontology 26(4):641-644 [S. Holland/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10391: authorized by Steven Holland, entered by Tori Hanson on 12.04.2001, edited by Melanie Hopkins

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Pterygometopidae
Isalaux canyonensis n. gen. n. sp.
Isalaux canyonensis n. gen. n. sp. Frederickson and Pollack 1952 trilobite
Bivalvia
 Solemyida - Ctenodontidae
Ctenodonta sp.
Ctenodonta sp. Salter 1852 clam
 Cyrtodontida - Cyrtodontidae
Vanuxemia rotundata
Gastropoda
 Euomphalina - Holopeidae
"Eccyliomphalus contiguus" = Pachystrophia contiguus
"Eccyliomphalus contiguus" = Pachystrophia contiguus Ulrich and Scofield 1897 snail
Cephalopoda
 Orthocerida - Kionoceratidae
Kionoceras sp.
Kionoceras sp. Hyatt 1884
 Actinocerida - Ormoceratidae
Ormoceras sp.
Ormoceras sp. Stokes 1840