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flint projectile points

Uses of Flint | Tools, weapons, fire starters, gemstones

geology.com

North American key time-slice paleogeographic maps

North American key time-slice paleogeographic maps

cpgeosystems.com

Marble

Serpentine: Former seafloor

image greenstone basalt - Bing Images

Special Publication 122 cover

Information about "Butte_Geology.png" on geology - Chico - LocalWiki

Handbook of Nature Study: Rock Study #5: Rhyolite

Scratch test rock identification

How To Perform the Mohs Test

Neighborhood Rocks: Acid Test

farallon subduction.gif