Selma Group

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Selma Group
Stratigraphic range: Upper Cretaceous
Prairie Bluff Chalk Formation Starkville MS 052510.JPG
Prairie Bluff Chalk Formation of the Selma Group exposed in Starkville, Mississippi.
Type Geological formation
Sub-units Mooreville Chalk Formation
Demopolis Chalk Formation
Ripley Formation
Prairie Bluff Chalk Formation
Underlies Midway Group
Overlies Eutaw Formation
Primary Chalk
Other Glauconitic sandstone
Region Alabama, Georgia, Mississippi, Tennessee
Country  United States
Type section
Named for Selma, Alabama
Stratigraphic column for the Selma

The Selma Group is a geological formation in North America, within the U.S. states of Alabama, Mississippi, and Tennessee. The strata date from the Santonian to the Maastrichtian stages of the Late Cretaceous. The group is composed of, in ascending order, the Mooreville Chalk Formation, Demopolis Chalk Formation, Ripley Formation, and Prairie Bluff Chalk Formation. Dinosaur and mosasaur remains are among the fossils that have been recovered from the Selma Group.[1][2]

Oil was discovered in 1939 within the Late Cretaceous Woodruff Sandstone within the Selma Chalk Formation. Known as Mississippi's first oil field, the Tinsley Oil Field is located adjacent to Tinsley, Mississippi.[3]

See also[edit]


  1. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
  2. ^ Kiernan, Caitlin R. (2002). "Stratigraphic distribution and habitat segregation of mosasaurs in the Upper Cretaceous of western and central Alabama, with an historical review of Alabama mosasaur discoveries". Journal of Vertebrate Paleontology. 22 (1): 91–103. doi:10.1671/0272-4634(2002)022[0091:SDAHSO]2.0.CO;2. Retrieved 2009-02-02. 
  3. ^ Shelton, M.F. (1976). Braunstein, Jules, ed. Tinsley Oil Field, Yazoo County, Mississippi, in North American Oil and Gas Fields. Tulsa: The American Association of Petroleum Geologists. pp. 239–258. ISBN 0891813004.