1205-M-middle (Jurassic to of the United States)

Where: Bonneville, Madison, Teton County, Idaho (43.7° N, 111.3° W: paleocoordinates 38.6° N, 54.7° W)

When: B Member (Twin Creek Limestone Formation), Middle Jurassic to Middle Jurassic (174.1 - 145.0 Ma)

Environment/lithology: marine; lithified, fine-grained, ooidal, gray limestone

• Member B is a fine-grained gray to light-gray thin- to thick-bedded limestone. Many of the beds are oolitic.

Size classes: macrofossils, mesofossils

Primary reference: M. H. Staatz and H. F. Albee. 1966. Geology of the Garns Mountain Quadrangle Bonneville, Madison, and Teton Counties, Idaho. United States Geological Survey Bulletin (1205) [A. Zaffos/E. Ito]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 184616: authorized by Andrew Zaffos, entered by Erika Ito on 14.03.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Pectinida - Pectinoidae
Camptonectes sp. Meek 1864 scallop
 Pectinida - Limidae
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Neritoidea - Neritidae
Lyosoma powelli White 1876 snail
 Heterobranchia - Nerineidae
Nerinea sp. Deshayes 1827 snail