The Wilcox Group is an important geologic group in the Gulf of Mexico Basin and surrounding onshore areas from Mexico and Texas to Louisiana and Alabama. The group ranges in age from Paleocene to Eocene and is in Texas subdivided into the Calvert Bluff, Simsboro and Hooper Formations, and in Alabama into the Nanafalia and Hatchetigbee Formations. Other subdivisions are the Lower, Middle and Upper Wilcox Subgroups, and the Carrizo and Indio Formations.
Paleontology in Louisiana refers to paleontological research occurring within or conducted by people from the U.S. state of Louisiana. Outcrops of fossil-bearing sediments and sedimentary rocks within Louisiana are quite rare. In part, this is because Louisiana’s semi-humid climate results in the rapid weathering and erosion of any exposures and the growth of thick vegetation that conceal any fossil-bearing strata. In addition, Holocene alluvial sediments left behind by rivers like the Mississippi, Red, and Ouachita, as well as marsh deposits, cover about 55% of Louisiana and deeply bury local fossiliferous strata.
The Claiborne Formation or Claiborne Group is a geologic formation in Arkansas, Illinois, Kentucky, and Texas. It preserves fossils dating back to the Paleogene period.
The Belgrade Formation is a limestone geologic formation in North Carolina characterized by limestone coquina mixed with sand, and thinly laminated clays. It preserves fossils dating back to the Paleogene period.
The Patapsco Formation is a geologic formation of varigated clays, sandy clays, and sand in Virginia, the District of Columbia, Maryland, Delaware, Pennsylvania, and in the subsurface of New Jersey. It preserves fossils such as plants and molluscs dating back to the Cretaceous period.
The Fernvale Limestone is a geologic formation in Alabama, Arkansas, Illinois, Missouri, Oklahoma, and Tennessee. It preserves fossils dating back to the Ordovician period.
The Midway Group is a geologic group in the Mississippi Embayment of Tennessee, Arkansas, Mississippi, Louisiana, Texas and Alabama. It preserves fossils dated to the Paleogene period.
The Alum Bluff Group is a geologic group in the states of Georgia, Florida, and Alabama. It preserves fossils dating back to the Neogene period.
The Tallahatta Formation is a geologic formation found on the surface in Alabama, Florida, Georgia, and Mississippi. It is also located in the subsurface of Kentucky. The Tallahatta formation is part of the Claiborne Group and contains four members: the Basic City Shale in Mississippi, the Holy Springs Sand Member in Mississippi, the Meridian Sand Member in Alabama and Mississippi, and the Neshoba Sand Member in Mississippi. It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The Hatchetigbee Bluff Formation is a geologic formation in Alabama, Georgia, Louisiana and Mississippi. The youngest unit of the Wilcox Group preserves fossils dating back to the Ypresian stage of the Eocene period, or Wasatchian in the NALMA classification. The formation is named for Hatchetigbee Bluff on the Tombigbee River, Washington County, Alabama.
The Sucarnochee Clay is a geologic formation in Alabama. It preserves fossils dating back to the Paleogene period.
The Prairie Bluff Chalk is a geologic formation in Alabama and Mississippi. It preserves fossils dating back to the Cretaceous period.
The Winona Formation is a sand geologic formation in Mississippi. It preserves fossils dating back to the Paleogene period.
The St. Maurice Formation is an obsolete stratigraphic term for the Cane River Formation, which is the lowermost marine geologic formation within the Claiborne Group. In 1910, Harris proposed the term St. Maurice for all Claiborne strata, now known as the Claiborne Group, underlying the Cockfield Formation. As proposed, it was synonymous with the lowermost marine strata within the Claiborne Group. In 1926, Spooner subdivided the Claiborne Group underlying the Cockfield Formation, in descending order, into the (1) St. Maurice beds, (2) Sparta sand, and (3) Cane River beds. Afterwards in 1931, Moody proposed the same subdivisions as established by Spooner but substituted the term Cook Mountain, which had stratigraphic priority, for the term St. Maurice and raised each subdivision to the rank of a formation. Later, the term Cook Mountain was replaced by the term Cane River by Huner and the name Cane River Formation for this geologic unit was officially adopted the Louisiana Geological Survey and the United States Geological Survey. The Cane River Formation, formerly known as the St. Maurice Formation or St. Maurice beds, contains fossils dating back to the Paleogene period.
The Weches Formation is a greensand, slay, and shale geologic formation in Louisiana and Eastern Texas. It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The White Bluff Formation is a marl, sand, and clay geologic formation in Arkansas that is part of the Jackson Group. It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The Stone City Formation is a geologic formation in Texas. It preserves fossils dating back to the Paleogene period. Now known as Stone City Bluff in Burleson County, Texas, it is a special location on the Texas Gulf Coast Plain. It is the best of relatively few places where marine rocks of Paleogene age are exposed and available for public access. This access provides a window into Middle Eocene rocks that were deposited in the Gulf of Mexico approximately 41.8 million years ago.
The La Jolla Group is a group of geologic formations in coastal southwestern San Diego County, Southern California. Its locations include the coastal La Jolla San Diego region.
The Otay Formation is a geologic formation in San Diego County, California and northern Baja California state (Mexico). It is within the Peninsular Ranges province.
Alabama, 
Louisiana, and 
Mississippi 