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Mineral Resources > Online Spatial Data > Geology > by state > Mississippi Geology

Geologic units in Grenada county, Mississippi

Wilcox formation (Eocene) at surface, covers 27 % of this area

Wilcox formation - Irregularly bedded fine to coarse sand, more or less lignitic clay and lignite; includes bauxite bearing Fearn Springs sand member at base.

Lithology: clay or mud; sand; coal

Kosciusko formation (Eocene) at surface, covers 13 % of this area

Kosciusko formation - (Claiborne group), irregularly bedded sand, clay, and some quartzite.

Lithology: sand; clay or mud; quartzite

Alluvium (Holocene) at surface, covers 11 % of this area

Alluvium - Loam, sand, gravel, and clay; mapped only in Mississippi River Alluvial Plain.

Lithology: alluvium

Zilpha formation and Winona formation (Eocene) at surface, covers 13 % of this area

Zilpha formation and Winona formation - (Claiborne group), Zilpha clay, chocolate-colored clay containing some glauconitic sand, not recognized north of Yalobusha River; Winona sand, highly glauconitic sand, more or less clayey.

Lithology: sand; clay or mud

Tallahatta formation and Neshoba sand (Eocene) at surface, covers 36 % of this area

Tallahatta formation and Neshoba sand - (Claiborne group), Southeast of Pearl River predominantly more or less glauconitic claystone and clay with lenses of sand and some sandstone; highly cross-bedded sand at base; northwest of Pearl river predominantly sand, locally glauconitic, containing claystone and clay lenses and abundant clay stringers; Neshoba sand, sparingly glauconitic fairly coarse sand not recognized southeast of Newton County or north of Yalobusha River.

Lithology: claystone; clay or mud; sand; sandstone