Boonton Formation (NJ) - (Lower Jurassic) Olsen, P.E., 1980a[1] - Reddish-brown to brownish-purple, fine-grained, commonly micaceous sandstone, siltstone, and mudstone, in fining-upward sequences mostly 5 - 13 feet thick. Red, gray, and brownish-purple siltstone and black, blocky, partly dolomitic siltstone and shale are common in the lower part of the unit. Irregular mudcracks, symmetrical ripple marks, hummocky and trough cross-laminated, burrows, and evaporite minerals are abundant in red siltstone and mudstone. Gray, fine-grained sandstone may have carbonized plant remains and reptile footprints in middle and upper parts in unit. Maximum thickness regionally is about 1,640 ft.

All footprints shown here are from the early Jurassic Period (190 mya) from the Boonton Formation. The slabs here are red and olive-green sandstones which were deposited during the formation of the Newark rift basin. Typical ichnotaxon list: Anchisauripus tuberosus (small to medium sized theropod dinosaur), Anomoepus scambus (ornithischian dinosaur), Batrachopus deweyii (crocodylomorph), Grallator parallelus (small theropod dinosaur), Eubrontes giganteus (large theropod dinosaur), and others.