Historical:Tygett Sandstone 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: Pope Megagroup >>Clore Formation >>Tygett Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Elviran Stage
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Tygett Sandstone Member of the Clore Formation (Swann, 1963, p. 40, 42), the middle member, is named for Tygett School, Union County.

Type Section

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.


It consists of sandstone and minor amounts of shale.


Sigillaria trunks and fragments are common in some beds.


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