Usage:
Louann Salt (AR*,LA*,AL*,FL*,MS*,TX*)
Louann Formation (MS)
Louann Formation of Louark Group (AR-subsurface)
Subunits:
Pine Hill Anhydrite Member (MS,AL).
Geologic age:
Jurassic, Middle*
Jurassic, Late*
Type section, locality, area and/or origin of name:
Type section (subsurface): Gulf Refining Company, L. Werner Saw Mill Company well, Union Co., AR (Hazzard and others, 1947).
AAPG geologic province:
Arkla basin*
Mid-Gulf Coast basin*
Gulf Coast 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 ([ ]).