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Similar to and likely paired with NWA 002
It comes from the famous sites of the Hell Creek Formation in Montana (Maastrichtian stage
it features an outstanding preservation
Note the abundance of opaque minerals and the presence of chlorite in the microphotographs
30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus Similar to and likely pairedNice 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,