30303 - Gorgeous 3.04 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Olenellus chiefensis The impact melt lithology has

The impact melt lithology has almost the same composition but it is distinctly higher in Ni

Jell and Adrain 2002 and Sepkoski 2002

The sample has a fine rim

They probably are migrants because of lack of young or senile form

30303 - Gorgeous 3.04 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Olenellus chiefensis The impact melt lithology hasNice 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,