Tyson Member
Lithostratigraphy: Ottawa Limestone Megagroup >>Galena Group >>Decorah Subgroup >>Kings Lake Formation >>Tyson Member
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Trentonian Stage
Allostratigraphy: Tippecanoe 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)
H. B. Willman and T. C. Buschbach
Name
Original description
The Tyson Member of the Kings Lake Formation (Templeton and Willman, 1963, p. 111).
Derivation
Named for Tyson Hollow, St. Louis County, Missouri, the mouth of which is 0.5 mile northeast of the type section.
Other names
History/background
Type section
Type location
The type section of the Tyson Member is located in the same section as the Mincke type section (a railroad cut in the Meramec Valley bluff (near cen. E1/2 SE SE 21, 44N-4E)) where the Tyson is 7.5 feet thick.
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
The Tyson Member is the upper member of the Kings Lake Formation.
Extent and thickness
The Tyson Member thins northward to 4.3 feet in the Kings Lake type section and to 3.9 feet at New London, Missouri.
Lithology
The Tyson Member is largely dolomitic, silty, argillaceous limestone that weathers buff and chalky. It occurs in medium to thick beds and contains a few thin beds of buff to reddish brown shale, coarse calcarenite, and coquinite.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.
ISGS Codes
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