Muramotoceras was an unusual genus of heteromorphic ammonite.[2] It was known only from Japan until researchers reported in 2001 that the genus was present in Alaska's Matanuska Formation as well.[2] Its remains likely date to the middle Turonian (from 89.8 to 93.9 million years ago) in both areas.[2] Subsequently it was also described from the Santonian Gosau Group (Austria).[3]

Muramotoceras
Temporal range: Turonian–Santonian
Fossil of Muramotoceras from Upper Cretaceous of Japan
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Suborder: Ancyloceratina
Family: Nostoceratidae
Genus: Muramotoceras
Matsumoto, 1967[1]

See also

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Footnotes

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  1. ^ Matsumoto, T., 1967. Evolution of the Nostoceratidae (Cretaceous Hetermorph Ammonoids) Fac. Sci. Kyushu Univ. Mem. ser. D, geology 18 (2):331-347.
  2. ^ a b c "Age of the Bone-Bearing Unit," Pasche and May (2001); page 220.
  3. ^ Summesberger, H.; Kennedy, W. J.; Skoumal, P. (2017). "Early and middle Santonian Cephalopods from the Gosau Group (Upper Cretaceous, Austria) 2. Heteromorph Ammonoidea" (PDF). Abhandlungen der Geologischen Bundesanstalt in Wien. 71: 101–149.

References

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