Gratton Limestone Formation, between Pisgah Church and Divide Church (Ordovician of the United States)

Where: Tazewell County, Virginia (37.0° N, 81.0° W: paleocoordinates 30.0° S, 61.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Gratton Limestone Formation, Caradocian (460.9 - 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 34213: authorized by Steven Holland, entered by Tori Hanson on 21.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Phacopida - Pterygometopidae
Calyptaulax sp. Cooper 1930 trilobite
 Proetida - Bathyuridae
Bathyurus sp. Billings 1859 trilobite
 Beyrichiacea - Eurychilinidae
Primitiella sp. Ulrich 1894 ostracod