Offshore zone +3, Durham Quadrangle, north of Cooper Heights (Ordovician of the United States)

Where: Walker County, Georgia (34.8° N, 85.4° W: paleocoordinates 29.2° S, 66.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Caradoc (460.9 - 449.5 Ma)

• no information given

Environment/lithology: offshore; yellow, argillaceous limestone and gray, calcareous limestone

• alternations of thin, yellow argillaceous laminae and bluish-gray calcareous laminae less than 1 mm, occasionally interrupted by intraformational conglomerates and breccias; some black calcilutite and fine to coarsely crystalline limestone; in some areas a unit of lutitic and fine-grained limestone is present with black chert nodules.

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 32577: authorized by Steven Holland, entered by Tori Hanson on 09.07.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Leperditicopida - Leperditiidae
Leperditia fabulites ostracod
"Isochilina nelsoni" = Leperditia (Isochilina) ostracod
Jones ?
 Orthida - Platystrophiidae
Platystrophia trentonensis McEwan 1919
 Orthida - Plectorthidae
Hebertella frankfortensis James 1871
Hebertella occidentalis Hall 1847
 Myalinida - Ambonychiidae
"Byssonychia cf. intermedia" = Ambonychia
"Byssonychia cf. intermedia" = Ambonychia clam
(Meek & Worthen) [entered as Byssonchia intermedia]
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
 Labechiida - Stromatoceriidae
Tetradium fibratum
  - Florideophyceae
"Tetradium fibratum" = Prismostylus fibratum
"Tetradium fibratum" = Prismostylus fibratum Safford 1856