Hatchetigbee Bluff Formation
Stratigraphic range: Ypresian (Wasatchian) ~55–50 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Unit of	Wilcox Group
Sub-units	Bashi Member
Lithology
Primary	Marl, sandstone
Other	Shale, siltstone
Location
Coordinates	31°18′N 86°06′W / 31.3°N 86.1°W / 31.3; -86.1
Approximate paleocoordinates	33°06′N 71°42′W / 33.1°N 71.7°W / 33.1; -71.7
Region	Alabama  Georgia (U.S. state)  Louisiana Mississippi
Country	United States
Extent	Gulf of Mexico Basin
Type section
Named for	Hatchetigbee Bluff, Tombigbee River, Washington County, Alabama
Named by	Smith & Johnson
Year defined	1887
Hatchetigbee Bluff Formation (the United States) Show map of the United States Hatchetigbee Bluff Formation (Alabama) Show map of Alabama

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.^[1] The formation is named for Hatchetigbee Bluff on the Tombigbee River, Washington County, Alabama.^[2]

Wasatchian correlations in North America

Formation	Wasatch	DeBeque	Claron	Indian Meadows	Pass Peak	Tatman	Willwood	Golden Valley	Coldwater	Allenby	Kamloops	Ootsa Lake	Margaret	Nanjemoy	Hatchetigbee	Tetas de Cabra	Hannold Hill	Coalmont	Cuchara	Galisteo	San Jose	Ypresian (IUCS) • Itaboraian (SALMA) Bumbanian (ALMA) • Mangaorapan (NZ)
Basin	Powder River Uinta Piceance Colorado Plateau Wind River Green River Bighorn	Piceance	Colorado Plateau	Wind River	Green River	Bighorn		Williston	Okanagan	Princeton	Buck Creek	Nechako	Sverdrup	Potomac	GoM	Laguna Salada	Rio Grande	North Park	Raton	Galisteo	San Juan	Hatchetigbee Bluff Formation (North America)
Country	United States								Canada					United States		Mexico	United States
Copelemur
Coryphodon
Diacodexis
Homogalax
Oxyaena
Paramys
Primates
Birds
Reptiles
Fish
Insects
Flora
Environments	Alluvial-fluvio-lacustrine	Fluvial				Fluvial	Fluvio-lacustrine	Fluvial	Lacustrine		Fluvio-lacustrine		Deltaic-paludal	Shallow marine		Fluvial	Shallow marine	Fluvial		Fluvial		Wasatchian volcanoclastics Wasatchian fauna Wasatchian flora
Volcanic	Yes	No							Yes	No	Yes	No	Yes	No						Yes	No

• Sessa, J. A.; Bralower, T. J.; Patzkowsky, M. E.; Handley, J. C.; Ivany, L. C. (2012), "Environmental and biological controls on the diversity and ecology of Late Cretaceous through early Paleogene marine ecosystems in the US Gulf Coastal Plain", Paleobiology, 38 (2): 218–239, doi:10.1666/10042.1
• Dockery, D. T (1980), "Invertebrate Macropaleontolgy of the Clarke County Mississippi Area", Bulletin - Mississippi Geological, Economic and Topographic Survey, 122
• Hansen, T. A (1978), Ecological control of evolutionary rates in Paleocene - Eocene marine molluscs - Ph.D. thesis, Yale University, pp. 1–310
• Toulmin, L. D (1977), "Stratigraphic Distribution of Paleocene and Eocene Fossils in the Eastern Gulf Coast Region", Geological Survey of Alabama, Monograph, 13: 1–602
• Palmer, K. V.; Brann, D. C. (1965), "Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Peteropoda, Scaphopoda and Cephalopoda", Bulletins of American Paleontology, 48: 1–471
• Aldrich, T. H (1921), "New Eocene species from Alabama", Bulletins of American Paleontology, 9

• Smith, E.A., and Johnson, L.C., 1887, Tertiary and Cretaceous strata of the Tuscaloosa, Tombigbee, and Alabama Rivers: U.S. Geological Survey Bulletin, 43, 189 p.