Usage:
Jackson Group (AL*,AR*,LA*,MS*,MO,TX*)
Jackson Formation (AL*,AR*,KY*,LA*,MS*,MO*,TN*)
Subunits:
GROUP STATUS (alphabetical): Caddell Formation (TX*), Crystal River Formation (AL), Danville Landing Formation (LA), Manning Clay (TX*) or Manning Formation (TX*), Mirando sand [unranked, informal] (TX), Moodys Branch Formation (AL*,LA*,MS*), Mosley Hill Formation (LA), Ocala Limestone (AL*,MS*), Redfield Formation (AR), Rock Prairie Sandstone (TX), Roma Sandstone (TX, Mexico), Sanchez Sandstone (TX, Mexico), Villa Nueva sand [unranked, informal] (TX, Mexico?), Wellborn Formation (TX) or Wellborn Sandstone (TX*), White Bluff Formation (AR), Whitsett Formation (TX*), Yazoo Clay (AL*,LA*,MS*) or Yazoo Formation (AL*,LA*,MS*).
Geologic age:
early Tertiary (late Eocene)*
Type section, locality, area and/or origin of name:
Named from exposures at Jackson, MS, along Peak River and Moodys Branch (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
Arkla basin*
Desha basin*
East Texas basin*
Gulf Coast basin*
Mid-Gulf Coast basin*
Upper Mississippi embayment*
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 ([ ]).