Where: Washington County, Virginia (36.8° N, 82.3° W: paleocoordinates 19.9° S, 30.6° W)

• coordinate stated in text

• local area-level geographic resolution

When: Hillsdale Limestone Formation, Meramecian (343.0 - 335.5 Ma)

• On Geolex page, Hillsdale Limestone was assigned as member of the Greenbrier Fm. by Cardwell and others, 1968. The Greenbrier is assigned to the Meramecian - Chesterian age. The Hillsdale is directly below the Ste. Genevieve, which is listed as Chesterian (and given it's own local N. Am. stage name in Harland 1990), thus I decided that the Hillsdale Limestone is probably Late Meramec (= Holkerian - Asbian).

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, ooidal, gray, argillaceous, cherty/siliceous limestone

Preservation: replaced with silica

Primary reference: C. S., J.r. Bartlett and H. W. Webb. 1971. Geology of the Bristol and Wallace quadrangles, Virginia. Virginia Division of Mineral Resources Report of Investigations 25:1-93 [J. Alroy/M. Sommers/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 7001: authorized by John Alroy, entered by Mike Sommers on 20.04.2000, edited by Pete Wagner

Creative Commons license: CC BY (attribution)