Historical:Spring Grove Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Hunton Limestone Megagroup >>Wapsipinicon Limestone >>Spring Grove Member
Chronostratigraphy: Paleozoic Erathem >>Devonian System >>Middle Devonian Series
Allostratigraphy: Kaskaskia Sequence

Authors

Charles Collinson and Elwood Atherton

Name Origin

The Spring Grove Member of the Wapsipinicon Limestone is named for Spring Grove Township, Linn County, Iowa.

Type Section

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.

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.

Description

The Spring Grove Member of the Wapsipinicon Limestone (Stainbrook, 1935, p. 251-252) formerly was the upper part of the Kenwood. The Spring Grove Member is brown laminated dolomite and dolomitic limestone that weathers into thin plates.

Fossils

The Spring Grove Member is non-fossiliferous.

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

Stratigraphic Code Geo Unit Designation
6100
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