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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 28 (1944)

Issue: 10. (October)

First Page: 1519

Last Page: 1527

Title: Middle Devonian Subsurface Formations in Illinois

Author(s): Aldred S. Warthin, Jr. (2), G. Arthur Cooper (3)


The underground extent in Illinois of Middle Devonian beds is outlined, and formation names are suggested for use in subsurface work. The Grand Tower limestone and Dutch Creek sandstone are together considered the equivalent of the Geneva dolomite. Limits of the sequence of Hamilton age in Illinois are defined, and the probable distribution of the included formations is indicated. The Alto formation is assigned a post-Hamilton age, in part equivalent to, but chiefly younger than, the Cedar Valley limestone in Illinois.

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