Triassic-Jurassic rift basins in eastern North America. The shaded relief map at right shows the distribution of Triassic and Jurassic rocks exposed at the Earth's surface in the eastern United States. Most of these green patches are rocks belonging to rift basins (the exception are the spotty green blotches in New Hampshire which are Late Jurassic igneous intrusions). From the USGS website Tapestry of Time and Terrain. The map below shows the location of the Newark basin and other Triassic-Jurassic rift basins in eastern North America. In addition to the exposed basins shown at right, the map below includes basins buried by Coastal Plain and continental-margin sediments. This map also shows the boundary faults of the basins (black lines with ticks) and older Paleozoic faults (black lines with triangles). Modified from Withjack et al. (1998).