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Shoshone Gravel - The River That Isn't There
Автор: George Moncure
Загружено: 2023-07-28
Просмотров: 827
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This is a short clip about visiting a high terrace above the Yellowstone Valley east of Billings, Montana. It is a tableland composed of gravel with pebbles and cobbles deposited by a river about 2 million years ago. But not the Yellowstone River. Deposited instead by the ancient Shoshone River that used to flow from the Absaroka Mountains to Billings, a route that shifted abruptly to its present course that flows into the Bighorn River about 100 miles to the south! This gravel composition reflects its Absaroka volcanic provenance.
Rocks and Gravel - Bob Dylan
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