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- Usage in publication:
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- Cornell Ranch member
- Modifications:
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- Original reference
- Dominant lithology:
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- Limestone
- Claystone
- Shale
- AAPG geologic province:
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- South Oklahoma folded belt
Summary:
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.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).