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.{{cite journal |last1=Merrill |first1=Robert K. |last2=Sims |first2=James J. |last3=Gann |first3=Delbert E. |last4=Liles |first4=Kenneth J. |title=Newton County geology and mineral resources |journal=Mississippi Bureau of Geology Bulletin |date=1985 |volume=126 |pages=33–34 |url=https://www.mdeq.ms.gov/wp-content/uploads/2017/06/Bulletin-126.pdf |accessdate=28 June 2018}} It was upgraded to formation status and is considered a separate formation from both by the Mississippi Dept. of Environmental Quality Office of Geology. 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. Fossils, molds, and casts are commonly found in lithified beds, and the fossil assemblage includes bivalves, gastropods, echinoids, shark teeth, crabs, foraminifera, and ostracods. The depositional environment for this formation is considered a shallow-water, near shore marine shelf facies as part of a marine transgression series.

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

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• {{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021}}

Category:Paleogene Mississippi

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