Historical:Drury Shale Member: Difference between revisions
mNo edit summary |
Alan.Myers (talk | contribs) No edit summary |
||
(One intermediate revision by one other user not shown) | |||
Line 1: | Line 1: | ||
{{B95}} | {{B95}}__NOTOC__{{Tree | ||
__NOTOC__ | |||
{{Tree | |||
|tree1=McCormick Group | |tree1=McCormick Group | ||
|tree2=Caseyville Formation | |tree2=Caseyville Formation | ||
Line 9: | Line 7: | ||
|tree23=Morrowan Series | |tree23=Morrowan Series | ||
|tree31=Absaroka Sequence | |tree31=Absaroka Sequence | ||
}} | }} | ||
==Authors== | ==Authors== |
Latest revision as of 16:21, 25 July 2018
Lithostratigraphy: McCormick Group >>Caseyville Formation >>Drury Shale Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Morrowan Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Drury Shale Member of the Caseyville Formation (Lamar, 1925, p. 91-95) is named for Drury Creek in Jackson County.
Type Section
The type section consists of exposures along Drury Creek south of Makanda (33, 34, 10S-1W).
Correlation
The Drury is equivalent to part of the Mansfield Sandstone of Indiana.
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.
Stratigraphic Position
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.
Description
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.
References
LAMAR, J. E., 1925, Geology and mineral resources of the Carbondale Quadrangle: Illinois State Geological Survey Bulletin 48, 172 p.
ISGS Codes
Stratigraphic Code | Geo Unit Designation |
---|---|