Folded quartz veins in schist in ceiling of overhang on Billy-goat Trail Location: Great Falls of the Potomac National Park near Potomac, MD Year: 2008 Merckdigitals catalogue number: 06-52896 Comments:

Mather Gorge with swimmers Location: Great Falls of the Potomac National Park near Potomac, MD Year: 2006 Merckslides catalogue number: 06-23139 Comments:

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