Pg. 158 (fig. 2), 159-161, 163. Cornell Ranch member of Sycamore formation. Consists of silty to sandy, clayey, cherty limestones, dolomitic claystones, and dark-gray calcareous clayey shales; at base is a soft green shale, locally pyritic and glauconitic, that lies with apparent conformity on Woodford formation. Above green shale is a series of gray silty, clayey dolomitic limestones that are locally glauconitic. Remainder of member consists of alternating beds of dark-gray calcareous shales and silty, clayey limestones; it is in this sequence that bulk of chert in Sycamore occurs. Total thickness up to 80 feet. Underlies Worthey member (new). Age is Mississippian.
Source: US geologic names lexicon (USGS Bull. 1200, p. 943).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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