Gratton Limestone Formation, Clinch Valley (Ordovician of the United States)

Where: Tazewell County, Virginia (37.1° N, 81.5° W: paleocoordinates 29.6° S, 61.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Gratton Limestone Formation, Caradoc (458.4 - 449.5 Ma)

• Ashbyan

• formation-level stratigraphic resolution

Environment/lithology: argillaceous limestone

• Argillaceous limestone with possible nodules od white chert, some clayey films between limestone laminae, mudcracked bedding surfaces. Reworking of the desiccated sediment produced lenses of edgewise conglomerate and sliver breccias.

Size class: macrofossils

Primary reference: B. N. Cooper and C. E. Prouty. 1943. Stratigraphy of the Lower Middle Ordovician of Tazewell County, Virginia. Bulletin of the Geological Society of America 54:819-886 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 34212: authorized by Steven Holland, entered by Tori Hanson on 21.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Ostracoda
 Hollinocopida - Euprimitiidae
Primitiella sp.
Primitiella sp. Ulrich 1894 ostracod
Trilobita
 Proetida - Bathyuridae
Bathyurus sp.
Bathyurus sp. Billings 1859 trilobite
 Phacopida - Pterygometopidae
Calyptaulax sp.
Calyptaulax sp. Cooper 1930 trilobite
Tetradium
  -
Tetradium cellulosum