[1] The Boonton Formation is composed of reddish-brown to reddish-purple fine grained sandstone, as well as red, gray, purple, and black siltstone and mudstone.

Typically, the sedimentary formations of the Newark Basin feature recurring periods of wet and dry deposition, resulting in a series of alternating red and gray-black beds.

However, the lower beds of the Boonton Formation show a wide variety of color and texture arranged in no particular order.

[1] Fish fossils, including the ray-finned Semiontus elegans, the coelacanth Diplurus longicaudatus, and others, such as Redfieldius and Ptycholepis, can be found in the uppermost parts of the formation.

[1] In other layers, indeterminate fossil ornithischian tracks have been noted[5] (Anomoepus is reported), along with additional reptile and dinosaur prints, such as those of Batrachopus, and the theropod Grallator.