Passaic Formation
The Passaic Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and New York. It was previously known as the Brunswick Formation since it was first described in the vicinity of New Brunswick, New Jersey. It is now named for the city of Passaic, New Jersey, which is near where its type section was described by paleontologist Paul E. Olsen.
Description
The Passaic is defined as a reddish-brown shale, siltstone and mudstone with a few green and brown shale interbeds; red and dark-gray interbedded argillites near the base. In New Jersey, there are conglomerate and sandstone beds within the formation.Depositional environment
The Passaic is mostly shallow lakes, playa, and alluvial fan deposits resulting from the rifting of Pangea. The red color is often evidence that the sediments were deposited in arid conditions. The Passaic Formation overlies the Lockatong Formation deep lake sediment cycles, which were deposited during wetter climatic cycles during the Late Triassic. These sediments came from the northwest and contain clasts from Appalachian formations.Fossils
- Clepsysaurus
- ''Hypsognathus fenneri''
Age