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National Geologic Map Database

Geologic Unit: Sylvan

Usage:

Sylvan Shale (KS*,OK*,TX)


Geologic age:

Late Ordovician (Cincinnatian; Maysvillian to Richmondian)*


Type section, locality, area and/or origin of name:

Named from exposures near former village of Sylvan, [in T. 3 S., R. 4 E., Tishomingo quadrangle, scale 1:125,000 (1901 ed.)], Johnston Co., OK (Taff, 1902).


AAPG geologic province:

South Oklahoma folded belt*
Ouachita folded belt
Arkoma basin
Chautauqua platform
Salina basin
Nemaha anticline
Sedgwick basin
Forest City basin
Central Kansas uplift
Permian basin
Anadarko basin


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).