North Twistwood Creek Member, Cocoa Sand Member, Pachuta Marl Member, and Shubuta Member
Overlies
Moodys Branch Formation
Lithology
Primary
clay
Other
sand, marl
Location
Region
Alabama, Louisiana, and Mississippi
Country
United States
Type section
Named for
Yazoo River
Yazoo Clay is a clay geologic formation in Alabama, Louisiana, and Mississippi. It was named after a bluff along the Yazoo River at Yazoo City, Mississippi.[1] It contains is a type of clay known as montmorillonite, making it a poor foundation material due to the fact that moisture causes extreme changes in volume. Sand, pyrite, and marl have all been noted in the formation. It preserves fossils from the Eocene, including the prehistoric cetaceans Basilosaurus and Zygorhiza, and the marine snake Pterosphenus.[1][2] Sharks, rays, eels, and fish have also been found from the formation.[3]
^ abMonroe, Watson H. (1954). "Geology of the Jackson Area Mississippi" (PDF). United States Geological Survey Bulletin. 986: 56–62. Retrieved 27 June 2018.
^Breard, Sylvester Q.; Stringer, Gary L. (1995). "Paleoenvironment of a Diverse Marine Vertebrate Fauna from the Yazoo Clay (Late Eocene) at Copenhagen, Caldwell Parish, Louisiana" (PDF). Gulf Coast Association of Geological Societies Transactions. 45.
YazooClay is a clay geologic formation in Alabama, Louisiana, and Mississippi. It was named after a bluff along the Yazoo River at Yazoo City, Mississippi...
by Campina YazooClay, a geologic formation in Alabama, Louisiana, and Mississippi Yazoo County, Mississippi Yazoo City, Mississippi Yazoo lands, a historic...
Stringer, G. L.; King, L. (2012). "Late Eocene Shark Coprolites from the YazooClay in Northeastern Louisiana". New Mexico Museum of Natural History and Science...
aquifers after the Mississippi River aquifer. Historically, the thick YazooClay made groundwater difficult to extract on the Jackson Prairie. The discovery...
Tullos Member of the YazooClay. In 1979, it was the site of a large whale skeleton discovery. The Moodys Branch Formation and YazooClay were extremely fossiliferous...
is questionable. The last record of Brychaetus is from the late Eocene YazooClay of Louisiana. Brychaetus had very long teeth which were half bone and...
Eggleston's great-grandfathers was Henry Clay Tyler, an early settler from Boston and a jeweler who gave the Yazoo City courthouse cupola its clock. When...
Neogene Jackson Group / Moodys Branch Formation Paleogene Jackson Group / YazooClay Paleogene Michoud Formation Midway Group / Logansport Formation Paleogene...
colored when breeding. The Yazoo darter inhabits small, clear, mostly spring-fed streams with substrates that include clay, sand, gravel, or silt. Its...
his army, under Maj. Gen. William Tecumseh Sherman, would advance to the Yazoo River and attempt to reach Vicksburg from the northeast, while Grant took...
Henry Clay Lewis (1825–1850) was an American short story writer and medical doctor whose work is largely attributed as the greatest example of humor in...
Yazoo City, Mississippi, where several residents recognized photographs of the suspect, a deputy marshal said. Metz apparently had contacts in Yazoo County...
names were honored by colonists in local towns) include the Natchez, the Yazoo, and the Biloxi. The first major European expedition into the territory...
in: Eocene La Meseta Formation, Antarctica London Clay, Selsey and Elmore Formations, England Yazoo Formation, Louisiana Moodys Branch Formation, Mississippi...
Tallahatchie Tate Tippah Tishomingo Union Walthall Washington Yalobusha Winston Yazoo Presidency of Ronald Reagan United States presidential elections in Mississippi...
Yazoo National Wildlife Refuge is a 12,941 acre (52.4 km2) National Wildlife Refuge located in Washington County, Mississippi. Named after the Yazoo tribe...
station serving the city of Jackson, Mississippi, including Madison County, Yazoo County, Rankin County, and Hinds County. The studios of WYAB are located...
Tate Tippah Tishomingo Union Walthall Washington Yalobusha Winston Warren Yazoo Coahoma Madison Marshall Tunica Wilkinson "1972 Presidential General Election...
Southeast. Two distinct styles exist; the first is a style of carved flint clay found over a wide geographical area but believed to be from the American...
other cities such as Picayune, Corinth and Oxford.[citation needed] The Yazoo County Council was founded in 1919, and closed in 1922. The Southwest Mississippi...
Cultural Center, formerly Yazoo City Public School, designed by R. H. Hunt Yazoo City City Hall (1906) designed by R. H. Hunt Yazoo County Courthouse built...
Global Information
Alabama, 
Louisiana, and 
Mississippi