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

Uploaded: 7 May 2020
Last Updated: 19 May 2020

630 megapixels
50,032 x 12,596 pixels
166.8 in X 42.0 in at 300dpi

In this panorama, the Potomac River can be seen flowing through Mather Gorge in Great Falls Park. It was taken from the Maryland side of Great Falls, looking towards the Virginia side. Cliffs of metagraywacke line Mather Gorge, and have been dated at ~460 Ma. Steeply dipping lamprophyre dikes can be seen intruding into the metagraywacke. A crystallization age of ~360 Ma has been obtained from K/Ar dating of biotite in the dikes.