Milk River Formation
| Milk River Formation Stratigraphic range: Upper Cretaceous |
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|---|---|
Outcrops along the Milk River
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| Type | Geological formation |
| Unit of | Montana Group |
| Sub-units | Telegraph Creek, Virgelle, Deadhorse Coulee Members |
| Overlies | Colorado Group |
| Thickness | up to 112 feet (30 m) |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Region | Alberta, Montana |
| Country |
 Canada,  United States
|
| Type section | |
| Named for | Milk River |
| Named by | Dowling, D.B., 1916 |
The Milk River Formation is a near- shore to terrestrial sedimentary unit deposited during the Late Cretaceous (late Santonian to early Campanian) in southern Alberta. It is equivalent to the marine Lea Park Formation of eastern Alberta, and the Eagle and Telegraph Creek Formations of north-central Montana, and to the upper part of the Niobrara Formation in Kansas.
In Alberta, the Milk River Formation is subdivided into the Telegraph Creek, Virgelle, and Deadhorse Coulee Members. The formation has produced an extensive but little known vertebrate fauna (see Table). Radiometric dates place deposition of the Milk River Formation between ~84.5 Ma and 83.5 Ma (Payenberg et al. 2002).
There are some dinosaur remains from the Formation, but these are not very well known. A more concerted effort at locating specimens would undoubtedly produce many new taxa.
(references: Brinkman 2003; Gao and Fox 1995; Hilton and Grande 2006; Larson 2008; Sullivan 2003; University of Alberta webpage)
Remains of an indeterminate lamnid genus and species are present.
Indeterminate
M. bipartitus
Remains of Acipenseridae, Amiidae, Esocidae, indeterminate genera and species.
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