State Pond Member

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Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Springville Shale >>State Pond Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series
Allostratigraphy: Kaskaskia Sequence

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback


Original description

The State Pond Member of the Springville Shale (Collinson and Scott, 1958a, p. 5).


Named for State Pond, an artificial lake a mile northwest of Jonesboro, Union County.

Other names


Type section

Type location

The type section of the State Pond Member is in the south bank of the stream, below the spillway of the dam (NW SE 14, 12S-2W), where the member is 14-15 inches thick.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The State Pond Member of the Springville Shale is the base of the formation.

Extent and thickness


The State Pond is a greenish gray, soft, glauconitic shale containing phosphate nodules.




Well log characteristics


The State Pond Member has yielded conodonts and ostracodes typical of the Fern Glen, Burlington, and Keokuk Limestones and probably is a deep-water equivalent of all three formations.

Age and correlation

Environments of deposition

Economic importance



COLLINSON, CHARLES, and A. J. SCOTT, 1958a, Age of the Springville Shale (Mississippian) of southern Illinois: Illinois State Geological Survey Circular 254, 12 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation