State Pond Member
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
Name
Original description
The State Pond Member of the Springville Shale (Collinson and Scott, 1958a, p. 5).
Derivation
Named for State Pond, an artificial lake a mile northwest of Jonesboro, Union County.
Other names
History/background
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
Lithology
The State Pond is a greenish gray, soft, glauconitic shale containing phosphate nodules.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
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
Remarks
References
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
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