US Department of the Interior @Interior
@badassack @BlackCanyonNPS not sure - seems like the river's flowed for 2M yrs, but some rocks at the bottom are Precambrian (2 billion yrs) — PolitiTweet.org
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Fri Sep 09 12:33:46 +0000 2016
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US Department of the Interior @Interior
@badassack @BlackCanyonNPS not sure - seems like the river's flowed for 2M yrs, but some rocks at the bottom are Precambrian (2 billion yrs) — PolitiTweet.org