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National Geologic Map Database

Geologic Unit: Pearlette

Usage:

Pearlette family ash bed (informal) (CO*,IA*,KS*,NE*,OK*,SD*,TX*)
(†Pearlette Ash Member of Sappa Formation* abandoned.)

Informal. The rank or lithologic term should not be capitalized.


Geologic age:

late Tertiary and Quaternary (late Pliocene and Pleistocene)*
Due to change in Plio-Pleistocene boundary, age may now be considered all or in part Pleistocene.


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

Named from old post office of Pearlette, Meade Co., southwestern KS (Cragin, 1896).


AAPG geologic province:

Anadarko basin*
Central Kansas uplift*
Cherokee basin*
Denver basin*
Forest City basin*
Iowa shelf*
Las Animas arch*
Nemaha anticline*
Palo Duro basin*
Permian basin*
Salina basin*
Sedgwick basin*
Sioux uplift*


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 ([ ]).