Geologic units in Newton county, Mississippi

Kosciusko formation (Eocene) at surface, covers 26 % of this area

(Claiborne group), Irregularly bedded sand, clay, and some quartzite.

Cook Mountain formation (Eocene) at surface, covers 22 % of this area

(Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.

Zilpha formation and Winona formation (Eocene) at surface, covers 14 % of this area

(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.

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

(Claiborne group), Irregularly bedded, more or less laminated liginitic clay, sand, and lignite; sparingly glauconitic.

Jackson group (Eocene) at surface, covers 11 % of this area

Yazoo clay, green and gray calcareous clay containing some sand and marl; Moodys Branch formation at base, shells embedded in glauconitic clayey quartz sand.

Tallahatta formation and Neshoba sand (Eocene) at surface, covers 9 % of this area

(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.

Wilcox formation (Eocene) at surface, covers 4 % of this area

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