Murray Bluff Sandstone Member
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.
M. E. Hopkins and J. A. Simon
The Murray Bluff Sandstone Member of the Abbott Formation (Weller, 1940, p. 40).
Named for the hill called Murray Bluff in Saline County.
The type section occurs at Murry Bluff (NE 35, 10S-5E).
The Murray Bluff Sandstone Member is the top member of the Abbott Formation in southern Illinois. A sandstone occurs at this position in the areas where the Litchfield and Assumption Coals of the Spoon Formation are present.
Extent and thickness
In the type section the sandstone is at least 60 feet thick and contains many liesegang rings (secondary iron-oxide diffusion banding). It is relatively thick in channel facies and thinner in nonchannel facies. The Murray Bluff has been identified at numerous localities throughout the outcrop area in southern Illinois, but its northward extent in the subsurface is generally not recognized.
Well log characteristics
Age and correlation
The Murray Bluff has been correlated with the Bernadotte Sandstone of western Illinois and the Aberdeen Sandstone Member of western Kentucky.
Environments of deposition
WELLER, J. M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey Report of Investigations 71, 71 p.
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