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This is a great photo of the Cape Cormorant formation in Newfoundland. Alternating layers of sandstone and shale.

Most Common Blue, Violet, and Purple Minerals

What Is My Blue or Purple Mineral?: Glaucophane

The Great Unconformity of the Grand Canyon and the Late Proterozoic-Cambrian Time Interval: Part I - Defining It

gabbro is a coarse-grained igneous rock, that contains feldspar and augite

Subduction: The Sinking of Tectonic Plates

Geology | Photo (c) 2008 Andrew Alden, licensed to About.com ( fair use policy ) Franciscan Rock

The Friday fold is some crumpled sedimentary rock near the Hayward Fault in California.

New study describes 200 million years of geological evolution

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