Geologic History
The Powder River Basin contains a section of Phanerozoic rocks up to 17,000 feet (5,200 m) thick, from Cambrian to Holocene.
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“No cause is left but the most ancient of all, the one, in fact, that from the beginning of our history has determined the very existence of politics, the cause of freedom versus tyranny.”
—Hannah Arendt (1906–1975)