Lithologic and faunal characteristics of the Howe limestone, Bennett shale, and Glenrock limestone members in their type area in southern Nebraska are essentially unchanged as far south as the area between Manhattan and Alma, Kansas. In this area the Howe limestone becomes an abundantly fossiliferous spergenite and is easily distinguished from the Bennett shale. The Glenrock limestone is absent from a point between Manhattan and Alma, Kansas, south to the vicinity of Eskridge, Kansas, where it reappears and is continuous into Oklahoma.
The distinctive spergenite-type Howe limestone can be recognized and distinguished from the fossiliferous shale and limestone beds of the Bennett shale from the vicinity of Alma, Kansas, southward into Oklahoma. The Orbiculoidea zone, which marks the base of the Bennett shale, persists from Nebraska through central and southern Kansas into Oklahoma, although the Bennett changes from chiefly shale to chiefly limestone.
The Glenrock limestone, except where absent in Wabaunsee County, Kansas, is continuous from Nebraska to Oklahoma and includes only the fossiliferous limestone below the Bennett Orbiculoidea zone. Generally it is thinner in central and southern Kansas than in Nebraska and northern Kansas.
The Howe limestone, limestone beds of the Bennett shale, and the Glenrock limestone each contain fusulinids in several of the measured sections included. Therefore, fusulinids are not useful for distinguishing member boundaries.
Kansas Geological Survey, Geology
Placed on web July 14, 2006; originally published Dec. 31, 1952.
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