The Triassic Stockton Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and New York.
It is laterally equivalent to the New Oxford Formation in the Gettysburg Basin of Pennsylvania and Maryland.
[1] The Stockton is defined as a light-gray to light brown and yellowish medium to coarse grained sandstone and reddish to purplish-brown siltstone and mudstone with shale interbeds; and interbedded argillite.
[1] Interfingered with the Stockton, the Lockatong Formation are lake sediments, which grew during wetter climatic cycles during the Late Triassic.
Relative age dating of the Stockton places it in the Upper Triassic System, i.e., deposition between 237 and 207 (±5) million years ago.