Unionid Coquina Site (Paleogene of the United States)

Also known as SC-289

Where: Park County, Wyoming (44.8° N, 109.1° W: paleocoordinates 50.2° N, 90.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Willwood Formation, Clarkforkian (56.2 - 54.9 Ma)

• "some 115 m higher stratigraphically" than SC-29

•the coquina is "a 10 cm thick carbonate-cemented bed"

• bed-level stratigraphic resolution

Environment/lithology: "channel"; lithified, shelly/skeletal, sandy limestone

• "the unionid coquina involved deposition in a larger perennial stream"
• "The [coquina] bed consists of broken, poorly sorted molluscan shells and fragments, detrital carbonate, quartz sand, carbonized wood, with occasional bone, scales, and teeth of vertebrates"

Size classes: macrofossils, mesofossils

Reposited in the UMMP

Primary reference: P. D. Gingerich. 1987. Early Eocene bats (Mammalia, Chiroptera) and other vertebrates in freshwater limestones of the Willlwood Formation, Clark's Fork Basin, Wyoming. Contributions from the Museum of Paleontology, University of Michigan 27(11):275-320 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 15217: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Will Clyde

Creative Commons license: CC BY (attribution)

Taxonomic list

• meter level same as SC-24 (see) according to Bowen and Bloch 2002
Actinopteri
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
Mammalia
 Theriamorpha - Viverravidae
Didymictis sp. Cope 1875 placental
 Theriamorpha - Phenacodontidae
Phenacodontidae indet.1 Cope 1881 condylarth
Ectocion sp. Cope 1882 condylarth
Reptilia
 Crocodylia - Alligatoridae
Allognathosuchus sp.2 Mook 1921 crocodilian
 Crocodylia -
Diplocynodon sp.2 Pomel 1847 crocodilian