Tygett Sandstone Member

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Lithostratigraphy: Pope Megagroup >>Clore Formation >>Tygett Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Elviran Stage
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 Tygett Sandstone Member of the Clore Formation (Swann, 1963, p. 40, 42).

Derivation

Named for Tygett School, Union County.

Other names

History/background

Type section

Type location

The type section of the Tygett (Swann, 1963, p. 40, 42) is located 1.5 miles north of Tygett School, on Bradshaw Creek (NE NW 24, 11S-1W), where it is 26 feet thick.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Tygett Sandstone Member is the middle member of the Clore Formation.

Extent and thickness

Lithology

It consists of sandstone and minor amounts of shale.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Sigillaria trunks and fragments are common in some beds.

Age and correlation

Environments of deposition

Economic importance

Remarks

References

SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
4130
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