Cobden Quadrangle Loc. 6 (Carboniferous of the United States)

Where: Union County, Illinois (37.5° N, 89.3° W: paleocoordinates 12.9° S, 31.5° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Tar Springs Formation (Chester Group), Carboniferous (358.9 - 298.9 Ma)

• bed-level stratigraphic resolution

Environment/lithology: delta plain; sandstone

• The distibution trends for plant fossils in the Chester Series of the Illinois Basin are interpreted as suggesting that successive, narrow deltaic lobes were built into the Illinois Basin during the Chesterian, and that only along these most active sites of depostion were land-plant habitats available. The restriction of plant fossils to the top of the clastic-dominated formations can be explained if the lower part of these units is interpreted as progradational, while only the uppermost part represents depostion on a delta platform.

Size class: macrofossils

Preservation: mold/impression, original carbon

Collection methods: surface (in situ),

Primary reference: J. R. Jennings. 1984. Distribution of Fossil Plant Taxa in the Upper Mississippian and Lower Pennsylvanian of the Illinois Basin. In P. K. Sutherland (ed.), Biostratigraphy (Compte Rendu, Congrès International de Stratigraphie et de Géologie du Carbonifère, 9th, v. 2) 2:301-312 [H. Sims/S. Ostrowski/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 23922: authorized by Hallie Sims, entered by Heather Lindon on 24.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchogonium
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Rhynchogonium fayettevillense