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Which 'activity'?

"The Bull Run flora, Copper Basin flora, and Elko flora were formed in the same time frame as a result of the activity" Which activity? The intermittent volcanicm? The activity of laying down lakebed sediments?-- Wetman ( talk) 23:48, 12 January 2015 (UTC) reply

Both, the volcanism which resulted in ash filled lake sediments-- Kev min § 23:49, 12 January 2015 (UTC) reply