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The Fox Hills Formation is a Cretaceous geologic formation in the northwestern Great Plains of North America. It is present from Alberta on the north to Colorado in the south. Fossil remains of dinosaurs , including tyrannosaurs , as well as large marine reptiles, such as mosasaurs , have been recovered from the formation.
North Dakota is underlain by Precambrian crystalline basement rock, although these rocks are less well understood than in neighboring states. In the Proterozoic, a mountain range known as the Western Dakota Mobile Belt formed between two billion and 1.8 billion years ago in connection with the Trans-Hudson orogeny, stretching north into Manitoba and Saskatchewan before eroding almost entirely ...
The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation. Dinosaurs and pterosaurs of Hell Creek Formation. In 1966, the Hell Creek Fossil Area was designated as a National Natural Landmark by the National Park Service. [5]
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Acipenser † Adocus Restorative model of the Late Cretaceous mammal Alphadon † Alphadon † Alphadon marshi † Altacreodus † Altacreodus magnus † Amersinia † Amersinia FU082 – informal † Amersinia FU82 – informal † Amesoneuron † Amesoneuron FU037 – informal † Amesoneuron FU37 – informal † Ampelopsis † Ampelopsis acerifolia † Anomia † Anomia gryphorhyncha ...
A Late Cretaceous ammonite found in the Fox Hills Formation. Some of South Dakota's ammonites were very unusual for the group. [1]: 256 During the Late Cretaceous, the region now occupied by the Black Hills of South Dakota may have attracted long-necked plesiosaurs from hundreds of miles away as a source of gastroliths.
Jeletzkytes is an extinct genus of scaphatoid ammonite from the Upper Cretaceous (Maastrichtian) of North America named and described by Riccardi, 1983. In overall form Jeletzkytes closely resembles the genus Scaphites .
The Pierre is overlain by marginal marine deposits of the Fox Hills Formation. Most of the formation was deposited in the Campanian Age of the late Cretaceous . However, the discovery of fossils of Baculites baculus in the uppermost beds of the Pierre Shale in the Raton, New Mexico area show that deposition continued here into the early ...