It primarily consists of massive dark gray clays and silts with carbonized wood fragments and pyrite, deposited in a marine setting.

The remains of the dinosaur Hadrosaurus have been recovered from this formation.

[1] Using radio isotope dating of bivalve shells, the formation has been dated to between 80.5 and 78.5 million years ago.

[2] However, a more accurate date make range from 83.6 to around 77.9 MYA.

This article about a specific stratigraphic formation in New Jersey is a stub.