Where: Juab County, Utah (39.8° N, 111.7° W: paleocoordinates 33.5° N, 54.4° W)
• coordinate estimated from map
When: Twelvemile Canyon Member (Arapien Shale Formation), Late/Upper Bathonian to Late/Upper Bathonian (167.7 - 161.2 Ma)
• From upper part of member.
Environment/lithology: marine; calcareous shale and siltstone
Size class: macrofossils
Collected by S. L. Schaff in 1936; reposited in the USNM
Primary reference: R. W. Imlay. 1964. Marine Jurassic Pelecypods From Central and Southern Utah. United States Geological Survey Professional Paper 483-C:C1-C42 [S. Holland/P. Monarrez]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 169050: authorized by Steven Holland, entered by Pedro Monarrez on 06.05.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Gastropoda indet. Cuvier 1795 snail | |
Bivalvia | |
Camptonectes stygius White 1874 scallop | |
"Myophorella (Promyophorella) montanaensis" = Trigonia montanaensis
"Myophorella (Promyophorella) montanaensis" = Trigonia montanaensis Meek 1873 clam | |
Pholadomya kingi clam | |
Astarte (Coelastarte) livingstonensis Imlay 1964 clam |