USGS Mesozoic Loc. 21618 - Twin Creek Limestone (Jurassic of the United States)

Where: Rich County, Utah (41.9° N, 111.3° W: paleocoordinates 33.9° N, 51.6° W)

• coordinate estimated from map

When: Sliderock Member (Twin Creek Limestone Formation), Bajocian (170.3 - 168.3 Ma)

• Upper 30ft of member.

Environment/lithology: marine; limestone

Size class: macrofossils

Preservation: mold/impression

Collected by : R.W. Imlay and John McIntyre in 1949; reposited in the USNM

Primary reference: R. W. Imlay. 1967. Twin Creek Limestone (Jurassic) in the Western Interior of the United States. United States Geological Survey Professional Paper 540:1-105 [S. Holland/P. Monarrez]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 167099: authorized by Steven Holland, entered by Pedro Monarrez on 07.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

 Carditida - Astartidae
Astarte meeki Stanton 1899 clam
 Cardiida - Anthracosiidae
"Pleuromya subcompressa" = Myacites (Pleuromya) subcompressa
"Pleuromya subcompressa" = Myacites (Pleuromya) subcompressa Meek 1873 clam
 Ostreida - Gryphaeidae
Gryphaea planoconvexa Whitfield 1876 oyster
subsp. fraterna
 Pectinida - Pectinoidae
Camptonectes sp. Meek 1864 scallop
 Ammonoidea -
? Eocephalites sp. Imlay 1967 ammonite
indet. sp. B
Eocephalites primus Imlay 1967 ammonite
 Ammonitida - Stephanoceratidae
Stemmatoceras aff. albertense, "Stephanoceras aff. nodosum" = Stephanoceras
"Stephanoceras aff. nodosum" = Stephanoceras ammonite