Drury Shale Member: Difference between revisions
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Revision as of 22:39, 27 January 2017
Lithostratigraphy: McCormick Group >>Caseyville Formation >>Drury Shale Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Morrowan 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 Drury Shale Member of the Caseyville Formation (Lamar, 1925, p. 91-95).
Derivation
Named for Drury Creek in Jackson County.
Other names
History/background
Type section
Type location
The type section consists of exposures along Drury Creek south of Makanda (33, 34, 10S-1W).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
All strata lying between the Battery Rock and Pounds Sandstones are considered equivalent to the Drury, but, for the sake of clarity in classification, the name "Drury" is not used in parts of southeastern Illinois where two other members of the Caseyville Formation - the Sellers Limestone and the Gentry Coal - occur within the Drury interval.
Extent and thickness
The Drury is as much as 100-150 feet thick in places near the type area, but the thickness varies somewhat, partly because of differential erosion prior to deposition of the overlying Pounds Sandstone.
Lithology
The Drury is a complex unit of sandy or silty shale, siltstone, and lenticular massive sandstone units, and is much like the Lusk Shale. It contains at least two thin, nonpersistent coals. Although rocks of Drury age are present in the subsurface of the southern part of the Illinois Basin, the Battery Rock and Pounds Sandstones cannot generally be differentiated in well logs, which makes it impractical to differentiate the Drury.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
The Drury is equivalent to part of the Mansfield Sandstone of Indiana.
Environments of deposition
Economic importance
Remarks
References
LAMAR, J. E., 1925, Geology and mineral resources of the Carbondale Quadrangle: Illinois State Geological Survey Bulletin 48, 172 p.
ISGS Codes
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