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Among the more recent works to which considerable significance must be attached are those of Charles Butts which deal primarily with the Mississippian stratigraphy of Kentucky but touch upon problems of adjoining areas (Butts, 1915, 1917, 1922). In the work on Jefferson County, Kentucky (1915), which set a standard in classification and nomenclature that was accepted and followed in most of the subsequent Kentucky literature and maps, Butts recognized a new grouping of formational units for the county and attempted correlation of them with similar units in adjoining areas, especially in southern Indiana.

Butts considered the “Knobstone” as “Osage” and divided the Jefferson County “group” into the following “formations” (Butts, 1915, p. 135):

Holtsclaw sandstone

Rosewood shale

Kenwood sandstone

New Providence shale

He pointed out that the Rockford limestone of Indiana, representing the Kinderhook, is absent in Kentucky, and he believed that “there is a hiatus between the New Albany and New Providence measured by the Kinderhook group elsewhere” (Butts, 1915, p. 136). He related the New Providence shale to the Burlington limestone, and the remainder of the “Knobstone” to the Keokuk limestone.

Butts used Borden’s (1874) term “New Providence shale” for the basal clay-shale division of the group which has a thickness of 150 to 160 feet in Jefferson County. The Kenwood sandstone, with “a constant thickness of 40 feet throughout the county” was recognized immediately above.

Butts (1915, p. 150) introduced the name Rosewood, after the village of Rosewood, Harrison County, Indiana, . . .

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