Stratton's Farm Ditch (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, 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

• Clear offshore water
• Massive, irregularly bedded limestone, soft and argillaceous to hard and cherty (the latter predominating), light grey to yellowish-brown to dark brown. Softer material in bands and lenses.

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

Show authors, comments, and common names
unclassified
  -
Ophisthoptera cf. casei, Ophistoloba gouldi
Scyphozoa
 Conulariida - Conulariidae
Conularia sp.
Conularia sp. jellyfish
Anthozoa
 Stauriida - Streptelasmatidae
"Streptelasma rusticum" = Helicelasma rusticum
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral
Crinoidea
  -
Lichenocrinus tuberculatus
Stenolaemata
 Cyclostomata - Sagenellidae
"Proboscina auloporoides" = Tubulotrypa auloporoides
"Proboscina auloporoides" = Tubulotrypa auloporoides Nicholson 1875
 Trepostomata - Heterotrypidae
Heterotrypa sp.
Heterotrypa sp. Nicholson 1879
 Trepostomata - Halloporidae
Hallopora subnodosa
 Trepostomata - Trematoporidae
Batostoma sp.
Batostoma sp. Ulrich 1882
 Trepostomida - Amplexoporidae
Rhombotrypa quadrata
Rhombotrypa quadrata Rominger 1866
 Trepostomida - Monticuliporidae
Monticulipora epidermata
Rhynchonellata
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
Z. recurvirostris turgida and Z. recurvirostris noquettensis
 Orthida - Dalmanellidae
Dalmanella jugosa
Dalmanella jugosa
D. jugosa subplicata
 Orthida - Platystrophiidae
"Platystrophia moritura" = Vinlandostrophia moritura, Platystrophia acutilirata, Platystrophia clarksvillensis
"Platystrophia moritura" = Vinlandostrophia moritura Cumings 1908
 Orthida - Plectorthidae
Hebertella alveata, Hebertella occidentalis
Hebertella alveata Foerste 1909
 Orthida - Plaesiomyidae
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus
"Dinorthis (Plaesiomys) subquadrata" = Plaesiomys subquadratus Hall 1847
Strophomenata
 Strophomenida - Strophomenidae
Strophomena parvula, "Strophomena neglecta" = Tetraphalerella neglecta
Strophomena parvula Foerste 1917
"Strophomena neglecta" = Tetraphalerella neglecta James 1891
 Strophomenida - Furcitellidae
"Rafinesquina breviusculus" = Megamyonia breviuscula
"Rafinesquina breviusculus" = Megamyonia breviuscula Foerste 1917
 Strophomenida - Rafinesquinidae
Rafinesquina pregibbosa, Rafinesquina alternata
Lingulata
 Lingulida - Trematidae
Trematis rugosa
Craniata
 Craniida - Craniidae
"Crania scabiosa" = Petrocrania scabiosa
"Crania scabiosa" = Petrocrania scabiosa Hall 1866
Tentaculita
 Cornulitida - Cornulitidae
Cornulites corrugatus, Cornulites cf. sterlingensis
Tergomya
 Archinacellida - Archinacellidae
"Archinacella kagawongensis" = Archinacella kagawongensis, "Archinacella simmonsi" = Archinacella kagawongensis
"Archinacella kagawongensis" = Archinacella kagawongensis Foerste 1924
"Archinacella simmonsi" = Archinacella kagawongensis Foerste 1924
 Cyrtonellida - Cyrtolitidae
Cyrtolites ornatus
Cyrtolites ornatus Conrad 1838
 Scenelloidea - Scenellidae
? Scenella sp.
? Scenella sp. Billings 1872
Bivalvia
 Cyrtodontida - Cyrtodontidae
Cyrtodonta potteri, Cyrtodonta grandis
Cyrtodonta grandis Ulrich 1890 clam
 Myalinida - Ambonychiidae
"Clionychia angusta" = Anoptera angusta, "Byssonychia elroyi" = Ambonychia, "Anomalodonta griffini" = Opisthoptera griffini
"Clionychia angusta" = Anoptera angusta Foerste 1918 clam
"Byssonychia elroyi" = Ambonychia clam
"Anomalodonta griffini" = Opisthoptera griffini Hussey 1926 clam
 Ostreida - Pterineidae
Pterinea (Caritodens) demissa
 Modiomorphida - Modiomorphidae
Colpomya colgateri, Cymatonota cf. typicalis, Orthodesma cf. subangulatum, Orthodesma sp., Modiolopsis valida, Modiolopsis noquettensis
Cymatonota cf. typicalis Ulrich 1894 clam
Orthodesma sp. Hall and Whitfield 1875 clam
 Cardiidia - Grammysiidae
Cuneamya miamiensis
Cuneamya miamiensis Hall and Whitfield 1875 clam
 Nuculanida - Nuculanidae
Clidophorus ogontzensis
Clidophorus ogontzensis pointed nut clam
Cephalopoda
 Oncocerida - Oncoceratidae
Oncoceras sp.
Oncoceras sp. Hall 1847
 Orthocerida - Orthoceratidae
Orthoceras sp.
Orthoceras sp. Breynius 1832
Gastropoda
 Euomphalina - Platyceratidae
"Cyclora minuta" = Cyclonema minuta
"Cyclora minuta" = Cyclonema minuta Hall 1845 snail
 Euomphalina - Helicotomidae
Helicotoma brocki
Helicotoma brocki Foerste 1912 snail
 Euomphalina - Holopeidae
Holopea aff. hubbardi
Holopea aff. hubbardi Miller 1892 snail
 Murchisoniina - Eotomariidae
Liospira micula
Liospira micula Hall and Whitney 1862 snail
 Murchisoniina - Lophospiridae
Lophospira sp., "Lophospira bicincta" = Lophospira milleri, "Lophospira aff. pulchella" = Lophospira perangulata
Lophospira sp. Whitfield 1886 snail
"Lophospira bicincta" = Lophospira milleri Miller 1877 snail
"Lophospira aff. pulchella" = Lophospira perangulata Hall 1847 snail
 Murchisoniina - Trochonematidae
Trochonema wartheni
Trochonema wartheni Hussey 1926 snail
 Murchisoniina - Hormotomidae
Hormotoma gracilis
Hormotoma gracilis Hall 1847 snail
H. gracilis and H. gracilis aff. var. multivolvis
Trilobita
 Asaphida - Asaphidae
Onchometopus sp., Isotelus sp.
Onchometopus sp. Schmidt 1898 trilobite
Isotelus sp. Dekay 1824 trilobite
 Lichida - Lichidae
Amphilichas ? cucullus
Amphilichas ? cucullus Meek and Worthen 1865 trilobite
 Phacopida - Cheiruridae
Ceraurus simmonsi