30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus Tooth 11: 49 mm (1

Tooth 11: 49 mm (1

It comes from the famous sites of the Hell Creek Formation in Montana (Maastrichtian stage

Note the abundance of opaque minerals and the presence of chlorite in the microphotographs

Only has small glued fracture

and other fossils described are G

30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus Tooth 11: 49 mm (1Nice and well prepared specimen. Crotalocephalina sp, Pibyl and Vanek 1964 (trilobite) Trilobita Phacopida Cheiruridae Parent taxon: Cheiruridae according to P. A. Jell and J. M. Adrain 2002 See also Sepkoski 2002 Sister taxa: Acanthoparyphinae, Anasobella, Ancyginaspis, Arcticeraurinella, Areia, Areiaspis, Borealaspis, Bornholmaspis, Ceraurinium, Ceraurinus, Cerauroides, Cerauromeros, Cerauropeltis, Ceraurus, Chacomurus, Cheirurinae, Cheirurus,