Preakness Basalt

A thin, 2 to 8 m (6.6-26 ft) bed of siltstone (Jps) separates the lower flows.
State New Jersey
Name Preakness Basalt
Geologic age Lower Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Comments Newark Supergroup, Brunswick Group (Lyttle and Epstein, 1987). Units Jp and Jps are described together on printed map. The units were split into separate records and appropriate descriptions for each were used.
References
NGMDB product
Counties Somerset - Union