Grindstaff Sandstone Member

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Lithostratigraphy: McCormick Group >>Abbott Formation >>Grindstaff Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Atokan Series
Allostratigraphy: Absaroka 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)

M. E. Hopkins and J. A. Simon

Name

Original description

The Grindstaff Sandstone Member of the Abbott Formation (Butts, 1925, p. 44).

Derivation

Named for Grindstaff Hollow in Gallatin County.

Other names

History/background

Type section

Type location

Outcrops along Grindstaff Hollow (NE cor. 28, 10S-8E) are the type section.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

The Grindstaff varies considerably in thickness up to 60 feet.

Lithology

The Grindstaff is similar in appearance and characteristics to the other two sandstones of the Abbott Formation in southern Illinois. It is best developed east of the Du Quoin Monocline. The Grindstaff is generally fine or medium grained, most of it is slightly micaceous. It sometimes contains quartz granules and pebbles in the western part of the southern Illinois outcrop belt but generally fewer than occur in the underlying Caseyville sandstones. The sandstone is thickest and coarsest where it was deposited in local distributary or fluvial channels. It grades laterally into and overlies gray, silty or sandy shale. In a few places a very impure, sandy, clastic limestone or calcareous sandstone, formerly called the Boskydell Marine Zone or Boskydell Sandstone, is found at or near the position of the Grindstaff Sandstone in southwestern Illinois.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

The Grindstaff Sandstone is correlated with the Babylon Sandstone of western Illinois.

Environments of deposition

Economic importance

Remarks

References

BUTTS, CHARLES, 1925, Geology and mineral resources of the Equality-Shawneetown area: Illinois State Geological Survey Bulletin 47, 76 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
3610
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