Left: Geologic map of New Jersey. The colors represent rocks of different lithologies and/or geologic ages. The Newark rift basin is highlighted and forms much of the Piedmont physiographic province. Modified from NJ Geological Survey (1994). Bottom: Geology and topography of NJ. This version of the geologic map of NJ combines geology and topography. The green colors represent Triassic & Jurassic rocks of the Newark basin (NB). From the USGS website Tapestry of Time and Terrain.