Where: Idaho (43.4° N, 111.4° W: paleocoordinates 12.7° N, 34.8° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Thaynes Formation, Spathian (251.3 - 247.2 Ma)
• Most recently, the Thaynes formation has been separated into four facies belts, which include a basinal facies, an outer shelf facies, an inner shelf facies, and a red bed facies. the basinal facies consists of dark grey to black very siltly lime mudstones and gray to loive drab siltstones and shales. The outer shelf facies belt is characterized by dark grayish brown whole fossil wackestone, ranging to light gray bioclastic grainstone, with minor interbedded sanstone, siltstone, and mudstone. The inner shelf facies includes a variety of lithologies, mainly fine-grained mudstone and silty limestone, along with less common dolomite, siltstone, and bioturbated mudstone.
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified wackestone
Size class: macrofossils
Preservation: mold/impression
Primary reference: J. K. Schubert and D. J. Bottjer. 1995. Aftermath of the Permian-Triassic mass extinction event: Paleoecology of Lower Triassic carbonates in the western USA. Palaeogeography, Palaeoclimatology, Palaeoecology 116:1-39 [D. Bottjer/N. Bonuso/N. Bonuso]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 32977: authorized by David Bottjer, entered by Nicole Bonuso on 21.07.2003
Creative Commons license: CC BY (attribution)
Taxonomic list
Echinoidea | |
Miocidaris sp. Döderlein 1887 pencil urchin | |
Bivalvia | |
Promyalina sp. Kittl 1903 clam | |
Bakevellia sp. King 1848 oyster | |
Unionites sp. Wissman 1841 clam | |
Permophorus sp. Chavan 1954 clam | |
Trigoniacea indet. Lamarck 1819 clam |