Where: Delta County, Michigan (45.7° N, 87.0° W: paleocoordinates 19.5° S, 55.4° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Amorphognathus ordovicicus conodont zone, Ogontz Member (Stonington Formation), Richmondian (449.6 - 445.5 Ma)
• Richmond Formation, Stonington beds, Ogontz "member" of beds.
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; brown, gray, cherty/siliceous limestone
Size class: macrofossils
Primary reference: R. C. Hussey. 1926. The Richmond Formation of Michigan. In E. S. McCartney (ed.), Michigan University Contributions from the Museum of Geology 2:113-188 [S. Holland/T. Hanson/S. Bruning]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 26313: authorized by Steven Holland, entered by Tori Hanson on 12.10.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Anthozoa | |
"Streptelasma rusticum" = Helicelasma rusticum
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral | |
Scyphozoa | |
Conularia sp. jellyfish | |
Crinoidea | |
Lichenocrinus tuberculatus Sea lily | |
Trilobita | |
Onchometopus sp. Schmidt 1898 trilobite
Isotelus sp. Dekay 1824 trilobite | |
Amphilichas ? cucullus Meek and Worthen 1865 trilobite | |
Ceraurus simmonsi trilobite | |
Strophomenata | |
"Rafinesquina breviusculus" = Megamyonia breviuscula
"Rafinesquina breviusculus" = Megamyonia breviuscula Foerste 1917 | |
"Strophomena neglecta" = Tetraphalerella neglecta, Strophomena parvula
"Strophomena neglecta" = Tetraphalerella neglecta James 1891
Strophomena parvula Foerste 1917 | |
Rafinesquina alternata Conrad 1838 | |
Rhynchonellata | |
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 Z. recurvirostris turgida and Z. recurvirostris noquettensis
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Hebertella occidentalis Hall 1847
Hebertella alveata Foerste 1909 | |
"Platystrophia moritura" = Vinlandostrophia moritura, Platystrophia clarksvillensis, Platystrophia acutilirata
"Platystrophia moritura" = Vinlandostrophia moritura Cumings 1908
Platystrophia clarksvillensis Foerste 1910
Platystrophia acutilirata Conrad 1842 | |
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus Hall 1847 | |
Lingulata | |
Craniata | |
"Crania scabiosa" = Petrocrania scabiosa
"Crania scabiosa" = Petrocrania scabiosa Hall 1866 | |
Stenolaemata | |
"Proboscina auloporoides" = Tubulotrypa auloporoides
"Proboscina auloporoides" = Tubulotrypa auloporoides Nicholson 1875 | |
Heterotrypa sp. Nicholson 1879 | |
Batostoma sp. Ulrich 1882 | |
Rhombotrypa quadrata Rominger 1866 | |
Tentaculita | |
Gastropoda | |
"Cyclora minuta" = Cyclonema minuta
"Cyclora minuta" = Cyclonema minuta Hall 1845 snail | |
Holopea aff. hubbardi Miller 1892 snail | |
Helicotoma brocki Foerste 1912 snail | |
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Trochonema wartheni Hussey 1926 snail | |
Lophospira sp., "Lophospira aff. pulchella" = Lophospira perangulata, "Lophospira bicincta" = Lophospira milleri
Lophospira sp. Whitfield 1886 snail
"Lophospira aff. pulchella" = Lophospira perangulata Hall 1847 snail
"Lophospira bicincta" = Lophospira milleri Miller 1877 snail | |
Liospira micula Hall and Whitney 1862 snail | |
Bivalvia | |
Clidophorus ogontzensis pointed nut clam | |
Cyrtodonta potteri clam
Cyrtodonta grandis Ulrich 1890 clam | |
Pterinea (Caritodens) demissa Conrad 1842 oyster | |
"Clionychia angusta" = Anoptera angusta, "Anomalodonta griffini" = Opisthoptera griffini, "Byssonychia elroyi" = Ambonychia
"Clionychia angusta" = Anoptera angusta Foerste 1918 clam
"Anomalodonta griffini" = Opisthoptera griffini Hussey 1926 clam
"Byssonychia elroyi" = Ambonychia clam | |
Colpomya colgateri, Modiolopsis valida, Modiolopsis noquettensis, Orthodesma cf. subangulatum, Orthodesma sp., Cymatonota cf. typicalis
Colpomya colgateri clam
Modiolopsis valida clam
Orthodesma sp. Hall and Whitfield 1875 clam
Cymatonota cf. typicalis Ulrich 1894 clam | |
Cuneamya miamiensis Hall and Whitfield 1875 clam | |
Tergomya | |
Cyrtolites ornatus Conrad 1838 | |
? Scenella sp. Billings 1872 | |
"Archinacella kagawongensis" = Archinacella kagawongensis, "Archinacella simmonsi" = Archinacella kagawongensis
"Archinacella kagawongensis" = Archinacella kagawongensis Foerste 1924
"Archinacella simmonsi" = Archinacella kagawongensis Foerste 1924 | |
Cephalopoda | |
Oncoceras sp. Hall 1847 | |
Orthoceras sp. Breynius 1832 |