Also known as Frederick Limestone - Loc. CCM/4 (of Rasetti, 1961), Willow Brook Quarry

Where: Frederick County, Virginia (39.4° N, 77.4° W: paleocoordinates 31.9° S, 80.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Dunderbergia trilobite zone, Frederick Limestone Formation, Dresbachian (497.0 - 485.4 Ma)

• STRATIGRAPHIC RELATIONS: From the Frederick Lmst., which according to Stose and Stose underlies the similar Grove Lmst (partly or possibly all Canadian=Trenpealeauian in age). AGE: Dresbachian, Dunderbergia zone. Rasetti (1961) found faunal similarities with the Aphelapsis faunizone (Palmer 1954) of Texas and the Dunderbergia faunizone (Lochman and Wilson 1958) , Dunderberg Shale of Nevada and Jubilee Lmys of B.C. (Kobayashi 1938, Palmer 1960) on the basis of correlation of Dunderbergia. STRATIGRAPHIC POSITION: From 6 ft thick limestone, overlying a 70 ft thick, locally outcroping limestone, and underlying a 35 ft limestone. Fossils collected from above 1 ft above base of unit.

• bed-level stratigraphic resolution

Environment/lithology: lithified, fine-grained, flat-pebble, gray limestone

Size class: macrofossils

Preservation: cast, mold/impression

Reposited in the USNM

• COLLECTOR: F. Rasetti (presumably late 1950's). REPOSITORY: USNM

Primary reference: F. Rasetti. 1961. Dresbachian and Franconian trilobites of the Conococheague and Frederick Limestones of the central Appalachians. Journal of Paleontology 35(1):104-124 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62205: authorized by Austin Hendy, entered by Austin Hendy on 14.07.2006

Creative Commons license: CC BY (attribution)