Comments on Gigapan: Grand Canyon GigaView #25 Blacktail Canyon

GigapanMagazine.org  vol 3 issue 1 The Great Unconformity - Welcome to the surface of the Earth, approx. 550 million years ago. The first layer of rock, at ground level here, is called the Vishnu Schist. It consists of several complex sets of sedimentary and volcanic that were laid down 1.8 billion years ag...

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    0.22 Gigapixels

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    May 11, 2010

    Date Taken

    April 08, 2010

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    PreCambrian, Zoroaster, Vishnu, travertine, carbonate, and 11 more

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