Offshore zone 0, horizon A, Dug Gap (Ordovician of the United States)

Where: Whitfield County, Georgia (34.7° N, 85.0° W: paleocoordinates 29.5° S, 66.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Caradoc (458.4 - 449.5 Ma)

• no information given

Environment/lithology: offshore; limestone and metamorphosed, gray quartzite

• Limestone, also with bentonite, varying from a light yellowish-brown to a compact, green, blocky clay with small biotite and quartz crystals

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 32633: authorized by Steven Holland, entered by Tori Hanson on 10.07.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Stenolaemata
 Cryptostomata - Escharoporidae
Escharopora sp.
Escharopora sp. Hall 1847
 Cryptostomata - Rhinidictyidae
Rhinidictya mutabilis, Pachydictya foliata
Rhinidictya mutabilis Ulrich 1882
Ulrich
Rhynchonellata
 Atrypida - Anazygidae
Zygospira sp., Zygospira modesta, "Zygospira recurvirostris" = Anazyga recurvirostra
Zygospira sp. Hall 1862
Zygospira modesta Hall 1847
(Say)
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
(Hall)
 Orthida - Plectorthidae
Hebertella sp.
Hebertella sp. Hall and Clarke 1892
 Orthida - Hesperorthidae
Hesperorthis sp.
Hesperorthis sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Strophomenidae
Strophomena sp., Strophomena incurvata
Strophomena sp. Rafinesque and De Blainville 1824
Strophomena incurvata Shephard 1838
(Shepard)
 Strophomenida - Rafinesquinidae
Rafinesquina sp.
Rafinesquina sp. Hall and Clarke 1892