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

Uploaded: 13 May 2020
Last Updated: 19 May 2020

184 megapixels
21,804 x 8,460 pixels
72.7 in X 28.2 in at 300dpi
96 pixels per inch

This is an image of chevron folds in the Catoctin Formation. The Catoctin Formation is a flood basalt which erupted during the rifting that formed the Iapatus Ocean (The Proto-Atlantic). It formed approximately 560 mya during the Ediacarin Period, part of the Pre-Cambrian. Since its deposition it has undergone hydrothermal alteration to a greenstone. At other localities one can find vesicles which have been infilled by epidote. This image is taken roughly 30 feet down section from the overlying Weverton formation. The image was taken just west of Thoroughfare Gap along the train tracks. This is along the eastern limb of the Blue Ridge Anticlinorium. The image was taken facing north. The approximate trend and plunge of the axis is 55->N35E