Winona Formation

The Winona Formation was originally described as a member of the Tallahatta Formation or as a member of the Lisbon Formation, both of which are members of the Claiborne Group.^[1][2] It was upgraded to formation status and is considered a separate formation from both by the Mississippi Dept. of Environmental Quality Office of Geology.^[2] The Winona formation is a medium to fine grain poorly sorted sand that contains silt, clay, and fossils. It has a high glauconite content, up to 50% in some areas.^[2] Fossils, molds, and casts are commonly found in lithified beds,^[2] and the fossil assemblage includes bivalves, gastropods, echinoids, shark teeth, crabs, foraminifera, and ostracods.^[1] The depositional environment for this formation is considered a shallow-water, near shore marine shelf facies as part of a marine transgression series.^[1][2]

• List of fossiliferous stratigraphic units in Mississippi
• Paleontology in Mississippi

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 19 August 2022. Retrieved 17 December 2021.

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