D1 (CO). South Fork Rock Creek (Ordovician of the United States)

Where: Sheridan County, Wyoming (44.4° N, 106.9° W: paleocoordinates 10.1° S, 66.3° W)

• coordinate based on unpublished field data

• outcrop-level geographic resolution

When: Horseshoe Mountain Member (Bighorn Dolomite Formation), Richmondian (449.5 - 443.7 Ma)

• "The red fossiliferous beds, 5 to 8 feet thick, are near the top of the eastward-dipping Bighorn Formation, separated from the overlying Devonian rocks to the east by about 10 feet of conodont-bearing Upper Ordovician limestone."

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal; lithified, red, argillaceous limestone

• Environment and tectonic setting based on unpublished field notes of SMH
• "red-weathering fossiliferous, argillaceous limestone"

Size class: macrofossils

Reposited in the FMNH

• also used collections from Miami University, Oxford, Ohio

Primary reference: R. W. Macomber. 1970. Articulate Brachiopods from the Upper Bighorn Formation (Late Ordovician) of Wyoming. Journal of Paleontology 44(3):416-450 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 65239: authorized by Steven Holland, entered by Steven Holland on 20.09.2006, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Strophomenida - Sowerbyellidae
Eochonetes maearum n. sp.1 Bauer and Stigall 2016
 Strophomenida - Strophomenidae
"Strophomena planocorrugata" = Rugomena planocorrugata, "Strophomena fluctuosa" = Nasutimena fluctuosa, Oepikina cf. pergibbosa, Megamyonia nitens
"Strophomena planocorrugata" = Rugomena planocorrugata Twenhofel 1928
"Strophomena fluctuosa" = Nasutimena fluctuosa Billings 1860
Megamyonia nitens Billings 1860
 Atrypida - Cyclospiridae
 Atrypida - Anazygidae
 Rhynchonellida - Rhynchotrematidae
"Lepidocyclus gigas" = Hiscobeccus gigas Wang 1949
 Orthida - Platyorthidae
Diceromyonia storeya Okulitch 1943
 Orthida - Plaesiomyidae
 Orthida - Hesperorthidae
 Orthida - Platystrophiidae
"Platystrophia prayi" = Gnamptorhynchos prayi Howe 1966
 Trepostomida -
Batostoma sp.2 Ulrich 1882
 Cryptostomata - Arthrostylidae
 Astraspidiformes -
Eriptychius americanus2 Walcott 1892
 Astrapidiformes - Astraspididae
Astraspis desiderata2 Walcott 1892
 Favositida - Favositidae
 Stauriida - Streptelasmatidae
 Stauriida - Lykophyllidae
"Holophragma" sp.2 Lindström 1896 horn coral