Talkeetna Mountains Hadrosaur
| Matanuska Formation Stratigraphic range: Late Cretaceous |
|
|---|---|
| Type | Geological formation |
| Location | |
| Region | North America |
The Matanuska Formation consists of more than 3 km (1.9 mi) 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 (Albian) to Late Cretaceous (Maestrichtian). Parts of the formation contain abundant marine mollusks, foraminifera, and radiolaria. Fossils of non-marine plants are found in some beds. Fossils of two dinosaurs have been recovered from marine mudstones in the formation. The lower Matanuska Formation (MF) is several hundred meters thick and includes non-marine and marine sediments. Campanian-Maastrichtian graded sandstone, conglomerate, and mudstone comprise the upper 2000 meters of the Formation.
Calcareous worm tube fossils are known from the formation.
Indeterminate
A. (Truncacila) sp.
I. cuvieri
I. hobetsensis
I. mamatensis
I. teshioensis
Indeterminate
Indeterminate
The formation's thin shelled heteromorphic ammonites probably lived at depths of 36–183 m. The formation's ammonites generally suggest that its rock were of Turonian age.
E. japonicum
Eubostrychoceras is known from Japan, Germany, and Madagascar.E. japonicum is Turonian, and likely confined to the middle Turonian.
G. denseplicatum
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