The Beartooth Mountains of Montana-Wyoming are principally composed of Archean-aged metamorphic rocks. The valley seen here is a scoop-shaped depression along the northern edge of a high plateau having a subalpine to alpine tundra landscape. The depression was eroded by an alpine glacier during the Pleistocene Ice Age - such depressions are called cirques. Two lakes are present in the cirque. Lakes in cirques are called "tarns".
Locality: Twin Lakes overlook, view from Route 212 (= Beartooth Highway), Beartooth Mountains, Wyoming-Montana border area, USA
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