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Fascinating Folded Float under Route 15 Bridge at Point of Rocks by Chris Johnson

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About This Gigapan

Taken by
Chris Johnson Chris Johnson
Explore score
0.55 Gigapixels
Date added
Feb 02, 2013
Date taken
Jan 29, 2013

This amazing piece of float was located under the Route 15 Bridge in Point of Rocks, MD. My current thinking is that the lower left corner is Catoctin formation but I am scratching my head over the upper right portion. Perhaps it is also Catoctin Metabasalt just with a different, more rigid consistancy. However, the presence of micas and what look like sand sized grains suggests that this may not be the case. Or is it a lense of some sort of sandy mudstone within the Catoctin? A litte bit of research showed that the Loudoun Formation (a pyroclastic unit) overlies the Catoctin Formation discontinuously in Maryland. So does this piece show the Catoctin-Loudoun Contact? Or, another explanation is that it could be a silty expression of the Weaverton (which overlies the Catoctin formation where the Loudoun Formation is mission). Or, I could be completely wrong. Anyhow, I am open to suggestions and the Description will be updated when I can come up with a more satisfactory explanation.

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Stitcher Notes


GigaPan Stitch version 2.0.0501 (Windows)
Panorama size: 547 megapixels (30064 x 18220 pixels)
Input images: 195 (15 columns by 13 rows)
Field of view: 42.2 degrees wide by 25.6 degrees high (top=-16.5, bottom=-42.1)
Vignette correction on: c1=-0.00253 c2=-0.0443
All default settings
Original image properties:
Camera make: Canon
Camera model: Canon PowerShot SX120 IS
Image size: 3648x2736 (10.0 megapixels)
Capture time: 2013-01-29 14:51:55 - 2013-01-29 15:12:05
Aperture: f/4.3
Exposure time: 0.02
ISO: 80
Focal length (35mm equiv.): 361.4 mm
Digital zoom: off
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 52.0 to 63.0 percent
Vertical overlap: 51.3 to 55.0 percent
Computer stats: 8183.89 MB RAM, 4 CPUs
Total time 1:02:37 (19 seconds per picture)
Alignment: 16:07, Projection: 5:16, Blending: 41:14
(Preview finished in 23:57)

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