Geologic map of New Jersey. The part of the Newark rift basin in New Jersey is highlighted in blue. Rock units in the Newark basin include Triassic- and Jurassic-age siltstone, shale, and sandstone and conglomerate (dark green and bright green, respectively); Jurassic basalt (lava flows; red); and Jurassic diabase (intrusive igneous rock; maroon). Line A-A' gives the location of the cross section at the bottom of the figure. Modified from NJ Geological Survey (2016).