Sawmill Flats - Bighorn Dolomite (Ordovician of the United States)

Where: Sheridan County, Wyoming (44.9° N, 107.5° W: paleocoordinates 9.5° S, 66.2° W)

• coordinate based on unpublished field data

• outcrop-level geographic resolution

When: Horseshoe Mountain Member (Bighorn Dolomite Formation), Richmondian (449.6 - 445.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified dolomite and lithified, dolomitic limestone

• environment based on unpublished field notes of SMH
• "Dolomite and dolomitic limestone. Mottled light orange to buff. Massive, abundant bugs and chert nodules. Forms cliff"

Size class: macrofossils

Primary reference: T.C. Gierlowski and R. L. Langenheim, Jr. 1985. Corals from the Late Ordovician Horseshoe Mountain Member, Bighorn Dolomite, Bighorn Mountains, Sheridan County, Wyoming. Wyoming Geological Association Earth Science Bulletin 18:1-21 [S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 65235: authorized by Steven Holland, entered by Steven Holland on 20.09.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Favositida - Favositidae
Paleofavosites prayi
Paleofavosites prayi Flower 1961 tabulate coral
 Sarcinulida - Syringophyllidae
Calapoecia coxi
Calapoecia coxi Bassler 1950 tabulate coral
 Heliolitida - Halysitidae
Catenipora robusta
Catenipora robusta Wilson 1926 tabulate coral
 Stauriida - Stauriidae
Palaeophyllum humei
Palaeophyllum humei Sinclair 1961 horn coral