WYOLIN-1-T (Jurassic to of the United States)

Also known as Kemmerer; U.S. Highway 189

Where: Lincoln County, Wyoming (41.9° N, 110.4° W: paleocoordinates 34.1° N, 51.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Twin Creek Limestone Formation, Bajocian to Bajocian (170.3 - 164.7 Ma)

• formation is "later Bajocian, all Bathonian, and very earliest Callovian" according to Imlay 1980, but the correlative Carmel Formation is Bajocian to early Bathonian according to Wilson et al. 1998

• group of beds-level stratigraphic resolution

Environment/lithology: sand shoal; lithified, ooidal, shelly/skeletal packstone

• "Twin Creek beds, overall, represent shallow, warm, oxygenated, abundantly populated, marine bottoms" and this exposure "probably was deposited under very shallow, turbulent, clear, warm waters over a shifting ooid-sand bottom"
• "oolitic limestone, a fossiliferous ooid packstone, brown to yellow to pink, partly spar-cemented (the rest micrite-infilled), with abundant crinoid debris... pelycypod shell fragments, occasional gastropods, and widely scattered bryozoan fragments (none in growth position)"

Size class: macrofossils

Collected by W. L. Stokes

• Penn State collection

Primary reference: R. J. Cuffey and J. E. Ehleiter. 1984. New bryozoan species from the mid-Jurassic Twin Creek and Carmel formations of Wyoming and Utah. Journal of Paleontology 58(3):668-682 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90519: authorized by John Alroy, entered by John Alroy on 04.08.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Gymnolaemata
 Ctenostomata - Ropalonariidae
Stenolaemata
 Cyclostomata - Entalophoridae
? Entalophora sp. Lamoureux 1821
 Cyclostomata - Diastoporidae
Crinoidea
 Isocrinida - Pentacrinitidae
Pentacrinus sp. Miller 1821 Sea lily