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RT @avast_project: So I visited the the snowy San Juan mountains of Southern Colorado, site of the 5000 km^3 Fish Canyon tuff (=VEI 9.2 eru…
RT @avast_project: So I visited the the snowy San Juan mountains of Southern Colorado, site of the 5000 km^3 Fish Canyon tuff (=VEI 9.2 eru…
So I visited the the snowy San Juan mountains of Southern Colorado, site of the 5000 km^3 Fish Canyon tuff (=VEI 9.2 eruption!), but I was after the 'blob-and-ash' dacite that immediately preceded it https://t.co/HkGtxhSg1U that I found thanks to @USGS Pet