Tioga Bentonite Bed: Difference between revisions
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Latest revision as of 17:52, 11 January 2017
Lithostratigraphy: Hunton Limestone Megagroup >>Grand Tower Limestone >>Tioga Bentonite Bed
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
The Tioga Bentonite Bed of the Grand Tower Limestone (Ebright et al., 1949, p. 10).
Derivation
Named for Tioga County, Pennsylvania, where it was first discovered in drill cuttings from the Tioga gas field.
Other names
History/background
Type section
Type location
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Extent and thickness
The Tioga Bentonite Bed is widely present in Illinois 10-30 feet below the top of the formation, but no outcrops have been found (Meents and Swann, 1965), except recently in a quarry at Tuscola in Douglas County. Although possibly as much as 6-8 inches thick in southeastern Illinois, it most commonly is only 1-2 inches thick. Its occurrence is patchy, but it has been observed in more than 100 wells and can be recognized on sonic logs even in areas where it is only a quarter of an inch thick.
Lithology
The Tioga Bentonite Bed is greenish to brownish gray shale that contains biotite flakes and an abundance of mixed layer clay minerals that distinguish it from the normal shales.
Core(s)
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Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
EBRIGHT, J. R. , C. R. FETTKE, and A. I. INGHAM, 1949, East Fork-Wharton gas field, Potter County, Pennsylvania: Pennsylvania Geological Survey Bulletin M30, Series 4, 43 p.
MEENTS, W. F., and D. H. SWANN, 1965, Grand Tower Limestone (Devonian) of southern Illinois: Illinois State Geological Survey Circular 389, 34 p.
ISGS Codes
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