Isabel Sandstone Member: Difference between revisions
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Revision as of 22:45, 26 January 2017
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Isabel Sandstone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka 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)
M. E. Hopkins and J. A. Simon
Name
Original description
The Isabel Sandstone Member of the Spoon Formation (Wanless, 1931a, p. 192).
Derivation
Named for Isabel Township, Fulton County.
Other names
History/background
Type section
Type location
Isabel Township includes the type section (NW NE 16, 4N-3E) (Wanless, 1956, p. 10; 1957, p. 83, 199).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Extent and thickness
Lithology
The name is used in western Illinois for a sandstone that generally is relatively thin, fine-grained, micaceous, feldspathic, and cemented with various amounts of calcium carbonate.
The Isabel and younger sandstones differ from the stratigraphically lower sandstones in western Illinois in that they are less quartzose, contain much more mica and feldspar, are not as well sorted, and do not show the abundant quartz overgrowths that produce the "sparkling sandstones." A sandstone is present at this position essentially throughout Illinois.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
In southern Illinois it is called the Palzo Sandstone.
Environments of deposition
Economic importance
Remarks
References
WANLESS, H. R., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
ISGS Codes
Stratigraphic Code | Geo Unit Designation |
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