Muramotoceras
Encyclopedia
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
as well. Its remains likely date to the middle Turonian in both areas.
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 Cretaceous to Late Cretaceous . Parts of the formation...
as well. Its remains likely date to the middle Turonian in both areas.