Great Falls of the Potomac Location: Great Falls of the Potomac National Park near Potomac, MD Year: 2006 Merckslides catalogue number: 06-23108 Comments:

Folded foliation planes and quartz veins in schist Location: Great Falls of the Potomac National Park - Olmstead Island overlook, MD Year: 2003 Merckslides catalogue number: Uncataloged (?) Comments:

Great Falls of the Potomac Location: Great Falls of the Potomac National Park - Olmstead Island overlook, MD Year: 2014 Merckdigitals catalogue number: 06-87481 Comments:

Great Falls of the Potomac Location: Great Falls of the Potomac National Park - Olmstead Island overlook, MD Year: 2014 Merckdigitals catalogue number: 06-87498 Comments:

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