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Only a few species of ammonites have been recorded from the Upper Cretaceous Navesink .Formation. An active group of amateur collectors has recently obtained many ammonite specimens from the basal part of this formation at Atlantic Highlands. The following forms can now be recognized: Baculites ovatus Say, B. c/aviformis Stephenson, Nostoceras helicimim (Shumard), N. hyatti Stephenson, N. cf. N. stantoni Hyatt, N . . pauper. (Whitfield), N. mendryki Cobban, n. sp., Axonoceras cf. A. angolanum Haas, Exiteloceras oronense (Lewy), Didymoceras navarroense (Shumard), Hoploscaphites pumilus (Stephenson), H. sp., and Pachydiscus sp. Most specimens represent the genera Baculites and Nostoceras; representatives of other genera are extremely scarce. The ammonites occur as uncrushed internal molds within 3 feet of the base of the Navesink Formation, which is dominantly a greensand unit about 25 feet thick. Body chambers and septate chambers are filled with soft dark-greenish-gray glauconitic sandstone. Th·e fossils can be assigned either to the very late Campanian or to the very early Maestrichtian. A late Campanian assignment is slightly favored from the molluscan evidence, although a Maestrichtian age is suggested by planktonic Foraminifera.

Ammonites from the Navesink Formation at Atlantic Highlands, New Jersey