''Muramotoceras'' was an unusual genus of
heteromorphic ammonite.
It was known only from Japan until researchers reported in 2001 that the genus was present in Alaska's
Matanuska Formation
The Matanuska Formation consists of more than of sedimentary strata exposed in the northern Chugach Mountains, Matanuska Valley, and southern Talkeetna Mountains of South-Central Alaska. The Matanuska Formation contains strata from Early Cretaceo ...
as well.
Its remains likely date to the middle Turonian (from 89.8 to 93.9 million years ago) in both areas.
Subsequently it was also described from the
Santonian
The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya (million years ago) and 83.6 ± 0.7 mya. The ...
Gosau Group
The Gosau Group (German: ''Gosau-Gruppe'') is a geological stratigraphic group in Austria, Germany and western Slovakia whose strata date back to the Late Cretaceous to Eocene.Höfling, 1985McCann, 2008 It is exposed in numerous sporadic isolated ...
(
Austria
Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...
).
See also
*
List of ammonites
This list of ammonites is a comprehensive listing of Genus, genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well those that may be invalid ...
Footnotes
References
*
External links
Paleotheque
Ammonitida genera
Nostoceratidae
Late Cretaceous ammonites of North America
Ammonites of Asia
{{ammonitida-stub