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Colchester, roof shales of No. 2 Coal Member (Carboniferous of the United States)

Where: McDonough County, Illinois (40.4° N, 90.8° W: paleocoordinates 7.1° S, 28.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Colchester (No. 2) Coal Member (Carbondale Formation), Bashkirian (318.1 - 314.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; shale

• Illinois basin
• From Peppers 1970 page 35, "The Colchester (No. 2) Coal is the basal member of the Carbondale Formation of Illinois (Kosanke et. al, 1960, .34). It is the most widedspread coal in the Illinois Basin and probably is not only the most widely traceable but also one of the most economically important coals in North America. In Illinois it attains its maximum thickness of about 4 feet in the western and northern part of the state, where it is extensivly mined."

Size classes: macrofossils, mesofossils

Preservation: mold/impression, original carbon

Collected by A. H. Worthen

Collection methods: quarrying

Primary reference: S. H. Scudder. 1868. Supplement to descriptions of articulates. Descriptions of fossil insects found on Mazon Creek, and near Morris, Grundy Co. Ill. Geological Survey of Illinois 3:566-572 [M. Clapham/M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 122575: authorized by Matthew Clapham, entered by Jered Karr on 03.01.2012

Creative Commons license: CC BY (attribution)