Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > North Carolina Geology
Geologic units in Hoke county, North Carolina
- Black Creek Formation (Cretaceous) at surface, covers 2 % 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.
- Cape Fear Formation (Cretaceous) at surface, covers 3 % of this area
Cape Fear Formation - sandstone and sandy mudstone, yellowish gray to bluish gray, mottled red to yellowish orange, indurated, graded and laterally continuos bedding, blocky clay, faint cross-bedding, feldspar and mica common.
- Middendorf Formation (Cretaceous) at surface, covers 86 % of this area
Middendorf Formation - sand, sandstone, and mudstone, gray to pale gray with an orange cast, mottled; clay balls and iron-cemented concretions common, beds laterally discontinuous, cross-bedding common.
- Castle Hayne Formation; Comfort Member and New Hanover Member, undivided (Tertiary) at surface, covers < 0.1 % 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.
- Pinehurst Formation (Tertiary) at surface, covers 9 % of this area
Pinehurst Formation - sand, medium- to coarse-grained, cross-bedding and rhythmic bands of clayey sand common, unconsolidated.
- Yorktown Formation and Duplin Formation, Undivided (Tertiary) at surface, covers 0.2 % 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.