Morgan sand (informal) in Cotton Valley Formation (AR)
Informal. The rank or lithologic term should not be capitalized.
Jurassic, Late
Not designated. Named from the Lion Oil Refining Co. and Phillips Petroleum Co. Edna Morgan A-1 in the Schuler pool, Union Co., AR (Weeks, 1938).
Arkla basin
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 ([ ]).