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

Geologic units in Holmes county, Mississippi

Cockfield (Eocene) at surface, covers 40 % of this area

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

Lithology: clay or mud; sand; coal; mixed clastic/coal

Cook Mountain formation (Eocene) at surface, covers 15 % of this area

Cook Mountain formation - (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.

Lithology: clay or mud; sand; limestone

Kosciusko formation (Eocene) at surface, covers 11 % of this area

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

Lithology: sand; clay or mud; quartzite

Jackson group (Eocene) at surface, covers 4 % of this area

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

Lithology: clay or mud; sand

Alluvium (Holocene) at surface, covers 27 % 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 1 % 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