Before the Mississippi, minerals show ancient rivers flowed west

Michigan zircons uncover path of ancient river system across North America

By Sid Perkins, 17:20 PM June 4, 2010

Like vacationers taking a pit stop on a long road trip, zircon mineral grains from the northern Appalachians may have stopped off in Michigan before ending up on the Colorado Plateau, a new study suggests. The finding, reported in the June Geology, is a major boost to the notion that a continent-spanning, Amazon-like river system once carried sediments west across North America.

A large proportion of the zircons found in Jurassic-era sandstones throughout a Texas-sized portion of the Colora...

Source URL: