Western brachiopod dominated biofacies, Platteville Fm., Minn/Wisc/Iowa/Ill (Ordovician of the United States)

Where: Wisconsin (43.0° N, 91.2° W: paleocoordinates 20.3° S, 63.2° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Mifflin Member (Platteville Formation), Blackriveran (457.3 - 449.6 Ma)

• "M. Ord (Blackriverian)"

Environment/lithology: shallow subtidal; carbonate

• "normal marine carbonate; shallow subtidal, muddy level bottom interior sea; west of molluscan biofacies. stable craton"

Size classes: macrofossils, mesofossils

Primary reference: P.W. Bretsky, S.S. Bretsky, and P.J. Schaefer. 1977. Molluscan and brachiopod dominated biofacies in the Platteville Formation (Middle Ordovician), upper Mississippi Valley. Bulletin of the Geological Society of Denmark 26:115-132 [M. Patzkowsky/Z. Krug]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 417: authorized by Jack Sepkoski, entered by Mike Sommers on 03.12.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Bretsky et al. 1977"
Show authors, comments, and common names
Stenolaemata
 Cryptostomata - Rhinidictyidae
Stictopora trentonensis
Rhynchonellata
 Orthida - Draboviidae
Pionodema conradi
 Orthida - Plaesiomyidae
Campylorthis deflecta
 Orthida - Hesperorthidae
Hesperorthis concava
Hesperorthis concava
originally entered as "Hesperothis concava"
 Protorthida - Skenidiidae
"Skenidioides anthonensis" = Skenidioides anthonense
"Skenidioides anthonensis" = Skenidioides anthonense Sardeson 1894
Strophomenata
 Strophomenida - Strophomenidae
Strophomena plattinensis
 Strophomenida - Furcitellidae
Oepikina minnesotensis
Oepikina minnesotensis Winchell 1881
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma gracilis
Hormotoma gracilis Hall 1847 snail
Ostracoda
 Leperditellocopida - Schmidtellidae
Schmidtella crassimarginata
Schmidtella crassimarginata Ulrich 1890 ostracod