Geologic units in Queens county, New York

Monmouth Group, Matawan Group and Magothy Formation (Upper Cretaceous) at surface, covers 65 % of this area

Silty clay, glauconitic sandy clay, sand, gravel.

Raritan Formation (Upper Cretaceous) at surface, covers 27 % of this area

Clay, silty clay, sand, gravel.

Glacial and Alluvial Deposits (Quaternary) at surface, covers 8 % of this area

Underlying bedrock geology unknown.

Harrison/Ravenswood Gneiss (Ordovician?) at surface, covers 0.7 % of this area

Harrison Gneiss - in New York and Connecticut, Brookfield diorite gneiss in Connecticut, and Ravenswood Gneiss in Brooklyn - biotite-hornblende-quartz-plagioclase gneiss with accessory garnet and sphene; plagioclase commonly occurs as augen.

Fordham Gneiss, undivided (Precambrian - Middle Proterozoic) at surface, covers < 0.1 % of this area

fe: garnet-biotite-quartz-plagioclase gneiss, and amphibolite; fd: sillimanite-garnet schistose gneiss, quartzite; fc: biotite-hornblende-quartz-plagioclase gneiss, quartz-feldspar lenses, amphibolite, biotite and/or hornblende-quartz-feldspar gneiss; fb: amphibolite, biotite and/or hornblende-garnet-quartz-plagioclase gneiss; fa: garnet-biotite-quartz-plagioclase gneiss, amphibolite, biotite-hornblende-quartz-plagioclase gneiss, quartz-feldspar granulite.

Inwood Marble (Early Cambrian - Lower Ordovician) at surface, covers < 0.1 % of this area

Dolomite marble, calc-schist, granulite, and quartzite, overlain by calcite marble; grades into underlying patchy Lowerre Quartzite of Early Cambrian age.