Spring Grove Member

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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

Stratigraphic Code Geo Unit Designation
6100
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