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Bighorn Range : ウィキペディア英語版
Bighorn Mountains

The Bighorn Mountains (Apsáalookěi: ' or ') are a mountain range in northern Wyoming and southern Montana in the United States, forming a northwest-trending spur from the Rocky Mountains extending approximately 200 miles (320 km) northward on the Great Plains. They are separated from the Absaroka Range, which lie on the main branch of the Rockies in western Wyoming, by the Bighorn Basin.
==Orogeny==
The Bighorns were uplifted during the Laramide orogeny beginning approximately 70 million years ago. They consist of over of sedimentary rock strata laid down before mountain-building began: the predominantly marine and near-shore sedimentary layers range from the Cambrian through the Lower Cretaceous, and are often rich in fossils. There is an unconformity where Silurian strata were exposed to erosion and are missing. Following the uplift, large volumes of sediments, rich in early Tertiary fossils, were deposited in the adjoining basins. Though many cirques, U-shaped valleys and glacial lakes can be found in the mountain range, the only remaining active glacier is the Cloud Peak Glacier, which is on the east slope of Cloud Peak.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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