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: 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; 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: CC0 (CC0)

Taxonomic list

unclassified
  -
Stromatoporoidea
 Labechiida - Stromatoceriidae
Stromatocerium pustulosum stromatoporoid sponge
Safford
Ostracoda
 Leperditicopida - Schrenckiidae
"Isochilina nelsoni" = Ivia nelsoni
"Isochilina nelsoni" = Ivia nelsoni Bassler 1932 ostracod
Jones ?
 Leperditicopida - Leperditiidae
Leperditia fabulites ostracod
(Conrad)
Bivalvia
 Myalinida - Ambonychiidae
"Byssonychia cf. intermedia" = Byssonychia intermedius
"Byssonychia cf. intermedia" = Byssonychia intermedius Meek and Worthen 1868 clam
(Meek & Worthen) [entered as Byssonchia intermedia]
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
Rhynchonellata
 Orthida - Plectorthidae
Hebertella frankfortensis James 1871
Foerste
Hebertella occidentalis Hall 1847
Hall
 Orthida - Platystrophiidae
Platystrophia trentonensis McEwan 1919
McEwan
Florideophyceae
  -
"Tetradium fibratum" = Prismostylus fibratum
"Tetradium fibratum" = Prismostylus fibratum Safford 1856
Safford
Tetradium
  -