Spring Grove Member
Lithostratigraphy: Hunton Limestone Megagroup >>Wapsipinicon Limestone >>Spring Grove Member
Chronostratigraphy: Paleozoic Erathem >>Devonian System >>Middle Devonian 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)
Charles Collinson and Elwood Atherton
Name
Original description
Derivation
The Spring Grove Member of the Wapsipinicon Limestone is named for Spring Grove Township, Linn County, Iowa.
Other names
History/background
Type section
Type location
The type section of the Spring Grove Member is located on the right bank of the Wapsipinicon River (cen. 24, 86N-7W) near Spring Grove Township, Linn County, Iowa.
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
The Spring Grove Member of the Wapsipinicon Limestone (Stainbrook, 1935, p. 251-252) formerly was the upper part of the Kenwood.
Extent and thickness
The Spring Grove Member is probably as much as 25 feet thick in subsurface, but it is only 5-10 feet thick in the outcrop area, where it is exposed in the quarries at Milan and Rock Island.
Lithology
The Spring Grove Member is brown laminated dolomite and dolomitic limestone that weathers into thin plates.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
The Spring Grove Member is non-fossiliferous.
Age and correlation
Environments of deposition
Economic importance
Remarks
References
STAINBROOK, M. A., 1935, Stratigraphy of the Devonian System of the Upper Mississippi Valley: Kansas Geological Society Guidebook, 9th Annual Field Conference, p. 248-260.
ISGS Codes
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