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Geologic units in Nassau county, New York

Monmouth Group, Matawan Group and Magothy Formation (Upper Cretaceous) at surface, covers 97 % of this area

Silty clay, glauconitic sandy clay, sand, gravel.

Glacial and Alluvial Deposits (Quaternary) at surface, covers 3 % of this area

Underlying bedrock geology unknown.

Raritan Formation (Upper Cretaceous) at surface, covers 0.3 % of this area

Clay, silty clay, sand, gravel.