Folds in schist Location: Great Falls of the Potomac National Park - Billygoat Trail, near Potomac, MD Year: 2003 Merckslides catalogue number: 06-17773 Comments:

Lamprophyre dikes on Virginia side of Mather Gorge Location: Great Falls of the Potomac National Park - Billygoat Trail, near Potomac, MD Year: 2008 Merckdigitals catalogue number: 06-50242 Comments:

Lamprophyre dikes on Virginia side of Mather Gorge Location: Great Falls of the Potomac National Park - Billygoat Trail, near Potomac, MD Year: 2010 Merckdigitals catalogue number: 06-73678 Comments:

Winter vegetation (laurel?) and schist on Billy-goat Trail Location: Great Falls of the Potomac National Park near Potomac, MD Year: 2008 Merckdigitals catalogue number: 06-50048 Comments:

Quartzite at base of the big climb - Billy-goat Trail Location: Great Falls of the Potomac National Park near Potomac, MD Year: 2008 Merckdigitals catalogue number: 06-50055 Comments:

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