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Metamorphosed, boudinaged bedding of the Mather Gorge Formation by Callan Bentley

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Taken by
Callan Bentley Callan Bentley
Explore score
1
Size
2.07 Gigapixels
Views
4072
Date added
May 10, 2011
Date taken
May 09, 2011
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Description

An exposure of the Mather Gorge Formation, downstream of the "emergency exit" trail off Billy Goat Trail loop A, and upstream of the first sandy beach. Immediately upstream of this outcrop is a prominent belt of amphibolite, and there are large angular amphibolite boudin blocks embedded in this strange rock. Interpreted as migmatitic metasediments, the dark schisty layers are interpreted as relict bedding, ancient mud layers recrystallized to schist and then boudinaged (broken into pieces) due to tectonic flattening. Interesting metamorphic textures with a "spongy" texture can be observed in several places, as well as migmatization (partial melting) as evidenced by the felsic, coarse-grained material seen filling the boudin necks. There is chocoalte tablet boudinage at this location too (though not completely shown by this gigapan).

Also in evidence are potholes and flood-smashed trees, showing the effects of the Potomac River on these outcrops. Here in Mather Gorge, the Potomac floods relatively frequently, cleaning off these rocks and allowing us a view into their mineralogy and structure that would otherwise be obscured by lichens or river slime.


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Stitcher Notes

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GigaPan Stitch version 1.1.1241 (Windows)
Panorama size: 2066 megapixels (76636 x 26968 pixels)
Input images: 495 (33 columns by 15 rows)
Field of view: 116.1 degrees wide by 40.9 degrees high (top=-8.8, bottom=-49.6)
Settings:
Vignette correction on: c1=0.0557 c2=-0.0501
All default settings
Original image properties:
Camera make: Canon
Camera model: Canon PowerShot SX120 IS
Image size: 3648x2736 (10.0 megapixels)
Capture time: 2011-05-09 04:47:07 - 2011-05-09 05:34:50
Aperture: f/6.3
Exposure time: 0.00125
ISO: 100
Focal length (35mm equiv.): 361.4 mm
Digital zoom: off
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 37.2 to 60.6 percent
Vertical overlap: 28.5 to 56.8 percent
Computer stats: 8175.03 MB RAM, 4 CPUs
Total time 1:00:13 (7.3 seconds per picture)
Alignment: 28:42, Projection: 10:34, Blending: 20:57
(Preview finished in 44:04)

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