PBDB Collection

Gratton Limestone Formation, US Route 19 (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, Caradoc (458.4 - 449.5 Ma)

• Ashbyan

• formation-level stratigraphic resolution

Environment/lithology: cherty/siliceous limestone

• Thick-bedded dove-gray calcilutytes; weathered surfaces of the third calcilutyte are light gray to creamy white. This zone locally contains intercalations of dark-gray cherty limestone.

Size classes: macrofossils, microfossils

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 34217: 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
Palaeocopida - Leperditellidae	Leperditella sp. Leperditella sp. ostracod
Palaeocopida - Euprimitiidae	Primitiella constricta Primitiella constricta Ulrich 1894 ostracod Ulrich
Leperditicopida - Isochilinidae	Isochilina sp. Isochilina sp. Jones 1858 ostracod
Cephalopoda
Orthocerida - Orthoceratidae	Orthoceras sp. Orthoceras sp. Breynius 1832 (common)
Gastropoda
Murchisoniina - Loxonematidae	Omospira cf. laticincta Omospira cf. laticincta Ulrich and Scofield 1897 snail Ulrich
Murchisoniina - Subulitidae	Subulites sp. Subulites sp. Emmons 1842 snail
Murchisoniina - Eotomariidae	Eotomaria sp. Eotomaria sp. Ulrich and Scofield 1897 snail
Stromatoporoidea
Labechiida - Aulaceratidae	Cryptophragmus antiquatus Cryptophragmus antiquatus Raymond 1914 stromatoporoid sponge Raymond (very rare)
Labechiida - Stromatoceriidae	Stromatocerium rugosum Stromatocerium rugosum Hall 1847 stromatoporoid sponge Hall (rare)
Tetradium
-	Tetradium cellulosum, Tetradium ? columnare, Tetradium racemosum Tetradium cellulosum (Hall) Tetradium ? columnare (Hall) Tetradium racemosum Raymond (common)