1205-base (Cambrian of the United States)

Where: Bonneville, Madison, Teton County, Idaho (43.7° N, 111.3° W: paleocoordinates 6.5° S, 83.6° W)

• local area-level geographic resolution

When: Gallatin Limestone Formation, Franconian (501.0 - 485.4 Ma)

• Also known as the Boysen Limestone by some stratigraphers. Fossils came from the basal part of the Ptychaspis-Prosaukia zone of Late Cambrian age.

Environment/lithology: marine; lithified, medium-grained, gray limestone and lithified, green shale

• Limestone, light-gray, medium- to coarse-grained; beds mostly 1-3 in. thick; contains numerous irregular green shale partings. Shale is more common towards base. Fossils were found in the lower half of this unit.

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 184601: authorized by Andrew Zaffos, entered by Erika Ito on 13.03.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Agnostida - Diplagnostidae
Pseudagnostus sp. Jaekel 1909 trilobite
 Olenida - Parabolinoididae
Taenicephalus sp. Ulrich and Resser 1924 trilobite
Croixana sp. Nelson 1951 trilobite
 Olenida - Idahoiidae
Idahoia sp. Walcott 1924 trilobite
Wilbernia sp. Walcott 1924 trilobite
"Merostomata indet." = Xiphosura
"Merostomata indet." = Xiphosura Latreille 1802
 Billingsellida - Billingsellidae
Billingsella sp. Hall and Clarke 1892
 Lingulida -
Linguloidea indet. Menke 1828
Conodonta indet. Eichenberg 1930 conodont