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rail-price-top · floating island · grid + stamp
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FeO/MnO=26-41)
Upper Llanvirnian
one of the three most common naturally occurring crystal forms of calcium carbonate
It comes from the famous sites of the Hell Creek Formation in Montana (Maastrichtian stage
it features an outstanding preservation
30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus FeO/MnO=26-41)Nice 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,
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