Geologic units in Richmond county, New York

Palisade Diabase (Early Jurassic) at surface, covers 10 % of this area: Palisade Diabase
Lithology: diabase
Raritan Formation (Upper Cretaceous) at surface, covers 54 % of this area: Raritan Formation - clay, silty clay, sand, gravel.
Lithology: clay or mud; silt; sand; gravel
Stockton Formation (Upper Triassic) at surface, covers 6 % of this area: Stockton Formation - arkose, conglomerate, and mudstone.
Lithology: arkose; conglomerate; mudstone
Serpentinite (Lower Ordovician) at surface, covers 26 % of this area: Serpentinite.
Lithology: serpentinite