Offshore zone -6, Durham Quadrangle, north of Cooper Heights (Ordovician of the United States)

Where: Walker County, Georgia (34.8° N, 85.4° W)

• Paleocoordinates: 19.8° S, 117.1° W (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Caradoc (458.2 - 449.5 Ma)

• no information given

Environment/lithology: offshore; gray, argillaceous limestone

• Gray to blue-brown, argillaceous to lutitic, fine-grained crystalline limestone, sometimes with shale (frequently red-brown in color).

Size class: macrofossils

Primary reference: A. T. Allen and J. G. Lester. 1957. Zonation of the Middle and Upper Ordovician strata in northwestern Georgia. Georgia State Division of Conservation, the Geological Survey Bulletin 66:1-104 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 32881: authorized by Steven Holland, entered by Tori Hanson on 16.07.2003

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Ancisrorhyncha costata, Multicostata sp.
Ancisrorhyncha costata
Ulrich & Cooper
Gastropoda
 Murchisoniina - Lophospiridae
Lophospira sp.
Lophospira sp. Whitfield 1886 snail
Cephalopoda
 Orthocerida - Orthoceratidae
Orthoceras sp.
Orthoceras sp. Breynius 1832
Rhynchonellata
 Orthida - Draboviidae
Pionodema subaequata
Pionodema subaequata Conrad 1843
(Conrad)
 Orthida - Plectorthidae
Hebertella sp.
Hebertella sp. Hall and Clarke 1892
 Orthida - Hesperorthidae
Hesperorthis tricenaria
Hesperorthis tricenaria Conrad 1843
(Conrad)
 Orthida - Plaesiomyidae
Multicostella sp., Dinorthis cf. atavoides
Dinorthis cf. atavoides Willard 1928
Willard
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
Glyptorthis bellarugosa Conrad 1843
(Conrad)
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
(Hall)
 Rhynchonellida - Ancistrorhynchidae
Ancistrorhyncha costata
Ancistrorhyncha costata Ulrich and Cooper 1942
Ulrich & Cooper
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella sp.
Sowerbyella sp. Jones 1928
Stenolaemata
 Cryptostomata - Rhinidictyidae
Rhinidictya mutabilis
Rhinidictya mutabilis Ulrich 1882
Ulrich
 Cryptostomata - Ptilodictyidae
Stictoporella sp.
Stictoporella sp. Ulrich 1882
 Cryptostomata - Arthrostylidae
Arthroclema armatum, Helopora spiniformis
Arthroclema armatum Ulrich 1890
Ulrich
 Trepostomida - Monticuliporidae
Homotrypa minnesotensis, Prasopora sp.
Prasopora sp. Nicholson and Etheridge 1877
Ostracoda
 Leperditicopida - Leperditiidae
Leperditia fabulites
Leperditia fabulites ostracod
(Conrad)