Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > North Carolina Geology
Geologic units in Brunswick county, North Carolina
- Socastee Formation (Pleistocene) at surface, covers < 0.1 % of this area
Socastee Formation: Low coastal formation in Carolinas like Penholoway but younger and lower in altitude.
- Alluvial Valley Swamp (Quaternary) at surface, covers < 0.1 % of this area
Alluvial Valley Swamp: Unconformable on all underlying units, fluvial sand and gravel at base, grading upwards into fine sands and silts, local peat. May be overrun with recent sediments from forest cutting and agriculture.
- Surficial Deposits, Undivided (Quaternary) at surface, covers 4 % of this area
Surficial Deposits, Undivided - sand, clay, gravel, and peat deposited in marine, fluvial, eolian, and lacustrine environments. Quaternary deposits not shown at altitudes greater than approx. 205 feet above mean sea level (Suffolk Scarp, in part).
- Peedee Formation (Cretaceous) at surface, covers 43 % 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.
- Waccamaw Formation (Tertiary) at surface, covers 50 % of this area
Waccamaw Formation - fossiliferous sand with silt and clay, bluish-gray to tan, loosely consolidated. Straddles Pleistocene-Pliocene boundary.
- Castle Hayne Formation; Comfort Member and New Hanover Member, undivided (Tertiary) at surface, covers 3 % 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.