12/6/2023 0 Comments Devil backbone mississippi8.) This cutoff placed in the Backbone most of the cherry rocks that for a short time had been called the Grassy Knob in Indiana. GG' also the map in Droste and Shaver, in preparation, fig. (See, for example, Becker and Droste, 1978, fig. In effect, therefore, an arbitrary vertical cutoff was defined between the two parts of the Grassy Knob facies relationship and placed along the farthest basinward extension of the lowest tongue of Backbone-like lithology. 4-5) recognized that Backbone-like deposits were in interfingered relationship with Grassy Knob-like rocks and in a complementary thickness, partial-facies relationship with Clear Creek-like deposits they also recognized that the clean coarse carbonate rocks at the top of what had been called the Bailey Limestone more appropriately belonged in the lowermost Backbone. Further refinement for Indiana was made when Becker and Droste (1978, fig. The term Backbone was later defined in the Illinois Basin, including in subsurface Indiana, by Collinson and others (1967, p. 4 W.) the Backbone consists of less than 100 feet of light-colored coarse-grained thick-bedded fossiliferous limestone. There in the type section in a quarry (SE¼SW¼SW¼ sec. Type section and use of name in Indiana: The Backbone Limestone was named for the ridge called the Devil's Backbone Ridge along the Mississippi River north of Grand Tower, Jackson County, southwestern Illinois (Savage, 1920, p. Indiana Geologic Names Information System Underground Coal Gasification Potential in the Illinois Basin Landmarks in Indiana Geology - A Timeline
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