Upper part north of Stratton's farm, Stratton's Dock (Ordovician of the United States)

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, Bay de Noc Member (Stonington Formation), Richmondian (449.6 - 445.5 Ma)

• Richmond Formation, Stonington beds, Bay de Noe "member" of beds.

• group of beds-level stratigraphic resolution

Environment/lithology: gray, argillaceous limestone

• Environmental call by T. Hanson. Paper suggests mouth of a river.
• Argillaceous limestone, relatively hard, coarsely crystalline, dark gray on fresh surfaces, weathering bluish, interbedded with argillaceous limestone, non-crystalline, gray to dark brown on fresh surfaces, weathering bluish and brown. The bedding planes are in undulating, discontinuous lines. Rock weathers rapidly.

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 26312: authorized by Steven Holland, entered by Tori Hanson on 11.10.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Cheiruridae
Ceraurus simmonsi
Stenolaemata
 Trepostomata - Heterotrypidae
Stigmatella sp.
Stigmatella sp. Ulrich and Bassler 1906
 Trepostomata - Halloporidae
Hallopora subnodosa
 Cyclostomata - Sagenellidae
"Proboscina auloporoides" = Tubulotrypa auloporoides
"Proboscina auloporoides" = Tubulotrypa auloporoides Nicholson 1875
 Trepostomida - Amplexoporidae
Rhombotrypa subquadrata, Rhombotrypa quadrata
Rhombotrypa quadrata Rominger 1866
 Trepostomida - Monticuliporidae
Mesotrypa sp., Monticulipora epidermata, Peronopora decipiens
Mesotrypa sp. Ulrich 1893
Craniata
 Craniida - Craniidae
"Crania scabiosa" = Petrocrania scabiosa
"Crania scabiosa" = Petrocrania scabiosa Hall 1866
Rhynchonellata
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
Z. recurvirostris turgida
 Orthida - Dalmanellidae
Dalmanella jugosa
Dalmanella jugosa
D. jugosa subplicata
 Orthida - Plaesiomyidae
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus Hall 1847
 Orthida - Plectorthidae
Hebertella occidentalis, Hebertella alveata
Hebertella alveata Foerste 1909
 Orthida - Platystrophiidae
Platystrophia spp., Platystrophia acutilirata, Platystrophia aff. cypha, Platystrophia clarksvillensis, "Platystrophia moritura" = Vinlandostrophia moritura, "Platystrophia annieana" = Vinlandostrophia annieana
"Platystrophia moritura" = Vinlandostrophia moritura Cumings 1908
"Platystrophia annieana" = Vinlandostrophia annieana Foerste 1910
Strophomenata
 Strophomenida - Furcitellidae
"Rafinesquina breviusculus" = Megamyonia breviuscula
"Rafinesquina breviusculus" = Megamyonia breviuscula Foerste 1917
 Strophomenida - Strophomenidae
"Strophomena neglecta" = Tetraphalerella neglecta, Strophomena parvula, Strophomena huronensis, Strophomena cf. nutans, Strophomena vetusta
"Strophomena neglecta" = Tetraphalerella neglecta James 1891
Strophomena parvula Foerste 1917
Strophomena huronensis Foerste 1912
Strophomena cf. nutans Hall and Clarke 1892
Strophomena vetusta James 1874
 Strophomenida - Rafinesquinidae
Rafinesquina pregibbosa, Rafinesquina alternata
Gastropoda
 Bellerophontida -
Bellerophontoidea indet.
Bellerophontoidea indet. M'Coy 1851 snail
 Bellerophontida - Bucaniidae
Phragmolites slawsoni
Phragmolites slawsoni Hussey 1926 snail
 Bellerophontida - Sinuitidae
Sinuites sp.
Sinuites sp. Koken 1896 snail
 Euomphalina - Platyceratidae
"Cyclora minuta" = Cyclonema minuta
"Cyclora minuta" = Cyclonema minuta Hall 1845 snail
Cephalopoda
 Endocerida - Endoceratidae
Endoceras sp.
Endoceras sp. Hall 1847
Bivalvia
 Ostreida - Pterineidae
Pterinea aff. insueta, Pterinea (Caritodens) demissa
Pterinea (Caritodens) demissa Conrad 1842 oyster
 Myalinida - Ambonychiidae
Anomalodonta cf. gigantea, "Byssonychia carinata" = Ambonychia, Byssonychia richmondensis
Anomalodonta cf. gigantea Miller 1874 clam
"Byssonychia carinata" = Ambonychia clam
Byssonychia richmondensis Ulrich 1893 clam
 Modiomorphida - Modiomorphidae
"Whiteavesia pholadiformis" = Pholadomorpha pholadiformis, "Psiloconcha sp." = Cymatonota, Modiolopsis valida
"Whiteavesia pholadiformis" = Pholadomorpha pholadiformis Hall 1851 clam
"Psiloconcha sp." = Cymatonota Ulrich 1893 clam
Anthozoa
 Stauriida - Streptelasmatidae
"Streptelasma rusticum" = Helicelasma rusticum, Streptelasma huronensis, Streptelasma divaricans
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral
Streptelasma divaricans Nicholson 1875 horn coral
Scyphozoa
 Conulariida - Conulariidae
Conularia formosa, Conularia sp.
Conularia sp. Miller 1820 jellyfish