Geologic units in Lee county, North Carolina

Newark Supergroup, Chatham Group; Sanford Formation (Triassic) at surface, covers 33 % of this area

Conglomerate, fanglomerate, sandstone, and mudstone.

Middendorf Formation (Cretaceous) at surface, covers 28 % of this area

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.

Newark Supergroup, Chatham Group; Pekin Formation (Triassic) at surface, covers 14 % of this area

Conglomerate, sandstone, and mudstone.

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 6 % of this area

Inequigranular and megacrystic; in places contains garnet; interlayered and gradational with mica schist and amphibolite; includes small masses of granitic rock.

Newark Supergroup, Chatham Group; Chatham Group, Undivided (Triassic) at surface, covers 6 % of this area

Conglomerate, fanglomerate, sandstone, and mudstone. Conglomerate and fanglomerate shown by pattern.

Phyllite and Schist (Cambrian/Late Proterozoic) at surface, covers 5 % of this area

Minor biotite and pyrite; includes phyllonite, sheared fine-grained metasediment and metavolcanic rock.

Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 4 % of this area

Metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Newark Supergroup, Chatham Group; Cumnock Formation (Triassic) at surface, covers 2 % of this area

Sandstone and mudstone, gray to black; coal beds and carbonaceous shale. Grades into Pekin and Sanford formations.

Cape Fear Formation (Cretaceous) at surface, covers 1 % of this area

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.

Foliated to Massive Granitic Rock (Permian/Pennsylvanian) at surface, covers 1 % of this area

Megacrystic to equigranular. Butterwood Creek intrusive and Rocky Mount intrusive suite.

Terrace Deposits and Upland Sediment (Tertiary) at surface, covers 0.1 % of this area

Gravel, clayey sand, and sand, minor iron-oxide cemented sandstone.

Newark Supergroup, Chatham Group; Diabase (Jurassic) at surface, covers < 0.1 % of this area

Diabase - dikes and sills, gray to black.