Hesperorthis-Sinuites Community (Ordovician of the United States)

Also known as Mifflin Submember, Platteville Fm, SW Wisconsin, Hesperorthis-Sinuites

Where: Wisconsin (42.7° N, 90.5° W: paleocoordinates 20.8° S, 63.1° W)

• coordinate estimated from map

When: Mifflin Member (McGregor Formation), Caradoc (458.4 - 449.5 Ma)

• Was: Platteville Formation, McGregor Member, Mifflin Submember

• member-level stratigraphic resolution

Environment/lithology: deep subtidal; mudstone and packstone

• pelletal mudstone-packstone approximately 10 m thick. Fossils were collected from coquinas.

Size class: macrofossils

Primary reference: C. W. Byers and S. Gavlin. 1979. Two contemporaneous equilibrium communities in the Ordovician of Wisconsin. Lethaia 12:297-305 [M. Patzkowsky/Z. Krug]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 55474: authorized by Mark Patzkowsky, entered by Zack Krug on 26.10.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Stauriida - Lambelasmatidae
Lambeophyllum sp.
Lambeophyllum sp. Okulitch 1938 horn coral
Trilobita
 Phacopida - Encrinuridae
Encrinurus sp.
Encrinurus sp. Emmrich 1844 trilobite
 Phacopida - Cheiruridae
Ceraurus sp.
Ceraurus sp. Green 1832 trilobite
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite
 Corynexochida - Illaenidae
Illaenus sp.
Illaenus sp. Dalman 1827 trilobite
Ostracoda
 Leperditicopida - Leperditiidae
Eoleperditia sp.
Eoleperditia sp. Swartz 1949 ostracod
Rhynchonellata
 Orthida - Plaesiomyidae
Campylorthis sp.
Campylorthis sp. Ulrich and Copper 1942
 Orthida - Hesperorthidae
Hesperorthis sp.
Hesperorthis sp. Schuchert and Cooper 1931
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema sp.
Rhynchotrema sp. Hall 1860
Strophomenata
 Strophomenida - Rafinesquinidae
Rafinesquina sp.
Rafinesquina sp. Hall and Clarke 1892
 Strophomenida - Strophomenidae
Strophomena sp., Opikina sp.
Strophomena sp. Rafinesque and De Blainville 1824
Opikina sp. Salmon 1942
Gastropoda
 Euomphalina - Helicotomidae
Ophiletina sp.
Ophiletina sp. Ulrich and Scofield 1897 snail
 Murchisoniina - Eotomariidae
Liospira sp.
Liospira sp. Ulrich and Scofield 1897 snail
 Murchisoniina - Hormotomidae
Hormotoma sp.
Hormotoma sp. Salter 1859 snail
 Murchisoniina - Trochonematidae
Trochonema sp.
Trochonema sp. Salter 1859 snail
 Murchisoniina - Lophospiridae
Lophospira sp.
Lophospira sp. Whitfield 1886 snail
 Bellerophontida - Bucaniidae
Phragmolites sp.
Phragmolites sp. Conrad 1838 snail
 Bellerophontida - Sinuitidae
Sinuites sp.
Sinuites sp. Koken 1896 snail
Cephalopoda
 Orthocerida - Orthoceratidae
Michelinoceras sp.
Michelinoceras sp. Foerste 1932
 Actinocerida - Actinoceratidae
Actinoceras sp.
Actinoceras sp. Bronn 1837
Bivalvia
 Cyrtodontida - Cyrtodontidae
Vanuxemia sp.
Vanuxemia sp. Billings 1858 clam