By: magic-gigapans
Image: Chris Johnson, Mid-Atlantic Geo-Image Collection
License: Creative Commons Non Commercial ⧉

Uploaded: 13 May 2020
Last Updated: 15 May 2020

374 megapixels
23,208 x 16,116 pixels
77.4 in X 53.7 in at 300dpi
254 pixels per inch

This outcrop can be found along the Difficult Run Trail north of Georgetown Pike. The North. This is part of the Mather Gorge Formation. A proterozoic metagraywacke. This outcrop is an example of partial melting in action. As the graywacke underwent high grades of metamorphism some of the minerals (particularly quartz and feldspars) began to melt and reform. This migmatite and others like it are the result of tectonic collisions during the Taconic and Acadian Orogenies.