Abstract
Shales approximately equivalent in age to Maquoketa beds in Iowa and to Sylvan strata in Oklahoma form the topmost Ordovician over much of central Kansas. They normally consist of two members: (1) an upper dolomitic gray shale, which is siliceous and cherty in some areas, and (2) a lower soft flaky shale. These beds are thickest in the central part of the Salina basin and also in a belt extending north-south through western Harvey County. They disappear on the flanks of the Nemaha arch and of the Central Kansas uplift, probably because of truncation, and also thin and disappear in the region of northern Sedgwick County, probably because of non-deposition in places, coupled also with some truncation. Possible sources of the shaly material include the Central Kansas uplift, Ozark dome, and volcanic dust dropped by winds into the muddy upper Ordovician seas.
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