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