Offshore zone +4, Fort Oglethorpe Quadrangle, Powder Mill Branch (Ordovician of the United States)

Where: Walker County, Georgia (34.9° N, 85.4° W: paleocoordinates 29.2° S, 66.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Caradoc (458.4 - 449.5 Ma)

• no information given

Environment/lithology: offshore; black, blue limestone

• black, lutitic to finely crystalline limestone. weathered surface is blue in color. some irregular argillaceous bands.

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 32562: authorized by Steven Holland, entered by Tori Hanson on 08.07.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
(Hall)
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema increbescens
Rhynchotrema increbescens Hall 1847
(Hall)
 Orthida - Plectorthidae
"Hebertella borealis" = Mimella borealis, Hebertella sp., Hebertella occidentalis, Hebertella frankfortensis
"Hebertella borealis" = Mimella borealis Billings 1859
(Billings)
Hebertella sp. Hall and Clarke 1892
Hebertella occidentalis Hall 1847
Hall
Hebertella frankfortensis James 1871
Foerste
Stenolaemata
 Cystoporata - Constellariidae
Constellaria sp.
Constellaria sp. Dana 1846
 Trepostomida - Monticuliporidae
Homotrypa curvata
Homotrypa curvata Ulrich 1882
var. praecipta Bassler
 Cryptostomata - Rhinidictyidae
Rhinidictya sp.
Rhinidictya sp. Ulrich 1882
 Trepostomata - Heterotrypidae
Dekayella sp.
Dekayella sp. Ulrich 1882
 Trepostomata - Halloporidae
"Callopora dumalis" = Hallopora, "Callopora goodhuensis" = Hallopora
"Callopora dumalis" = Hallopora
Ulrich
"Callopora goodhuensis" = Hallopora
Ulrich
 Trepostomata - Trematoporidae
Batostoma magnapora
 Trepostomata - Aisenvergiidae
Eridotrypa sp.
Eridotrypa sp. Ulrich 1893
Cephalopoda
 Orthocerida - Orthoceratidae
Orthoceras sp.
Orthoceras sp. Breynius 1832
Gastropoda
 Murchisoniina - Lophospiridae
Lophospira sp.
Lophospira sp. Whitfield 1886 snail
 Murchisoniina - Eotomariidae
Liospira sp.
Liospira sp. Ulrich and Scofield 1897 snail