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Mineral Resources > Online Spatial Data > Geology > by state > North Carolina Geology

Geologic units in Duplin county, North Carolina

Yorktown Formation and Duplin Formation, Undivided (Tertiary) at surface, covers 4 % of this area

Yorktown Formation and Duplin Formation, Undivided - Yorktown Formation: fossiliferous clay with varying amounts of fine-grained sand, bluish gray, shell material commonly concentrated in lenses; mainly in area north of Neuse River. Duplin Formation: shelly, medium- to coarse-grained sand, sandy marl, and limestone, bluish gray; mainly in area south of Neuse River.

Lithology: clay or mud; sand; limestone

Castle Hayne Formation; Comfort Member and New Hanover Member, undivided (Tertiary) at surface, covers 12 % of this area

Comfort Member and New Hanover Member, undivided - Comfort Member: bryozoan-echinoid skeletal limestone, locally dolomitized, solution cavities common. New Hanover Member: phosphate-pebble conglomerate, micritic, thin; restricted to basal part of Castle Hayne Formation in southeastern counties.

Lithology: limestone; dolostone (dolomite); conglomerate

Black Creek Formation (Cretaceous) at surface, covers 33 % of this area

Black Creek Formation - clay, gray to black, lignitic; contains thin beds and laminae of fine-grained micaceous sand and thick lenses of cross-bedded sand. Glauconitic, fossiliferous clayey sand lenses in upper part.

Lithology: clay or mud; sand

Peedee Formation (Cretaceous) at surface, covers 51 % of this area

Peedee Formation - sand, clayey sand, and clay, greenish gray to olive black, massive, glauconitic, locally fossiliferous and calcareous. Patches of sandy molluscan-mold limestone in upper part.

Lithology: sand; clay or mud; limestone