portrait

Granite dike cross-cutting amphibolite


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2001
Merckslides catalogue number: 06-14351
Comments:

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portrait

Shear zone in gneiss


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2006
Merckslides catalogue number: 06-23137
Comments:

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Outcrop of gneiss


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2006
Merckslides catalogue number: 06-23136
Comments:

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Kyanite pseudomorphs in gneiss


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2005
Merckslides catalogue number: 06-21456
Comments: This is always our last stop on the Geology 100 field trip.

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Eroded kyanite pseudomorphs in gneiss


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2008
Merckdigitals catalogue number: 06-50251
Comments: This is always our last stop on the Geology 100 field trip.

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portrait

Detail of eroded kyanite pseudomorphs (above)


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2008
Merckdigitals catalogue number: 06-50251
Comments: This is always our last stop on the Geology 100 field trip.

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portrait

Amphibolite


Location: Great Falls of the Potomac National Park - Billygoat Trail near "the beach", MD
Year: 2005
Merckslides catalogue number: 06-21455
Comments:

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