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Phoenix, AZ - Rock Cut on Liberty Lane near the Southern Edge of Ahwatukee. by David Pivin

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About This Gigapan

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Taken by
David Pivin David Pivin
Explore score
100
Size
6.55 Gigapixels
Views
599
Date added
Mar 31, 2014
Date taken
Mar 30, 2014
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Description

There are many foothills in Ahwatukee and none of them are made from the red sandstone found around many other parts of Phoenix. I ride my bike past this spot a couple of times a week and wondered what the layers would look like from the other side of the cut so I rode the dirt path and took this pano. You can see where there was drilling and blasting done to remove material. Many pieces of rock have fallen from the face of the cut and lie among the bushes. I'll leave the description of the face of the cut to the geologists.


Gigapan Comments (3)

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  1. David Pivin

    David Pivin (July 16, 2014, 05:39PM )

    Thanks for the commentary and snapshots, Ron. AZ has some great subjects for GigaPans.

  2. Ron Schott

    Ron Schott (July 16, 2014, 03:44PM )

    By the way, it's a wonderful GigaPan, David! These sorts of highly detailed GigaPans of roadcuts and outcrops are often superb teaching tools. Keep up the great work!

  3. Ron Schott

    Ron Schott (July 16, 2014, 03:21PM )

    I only have a very low-detailed geologic map of the area for reference, but it tells me that these are Early Proterozoic (1600Ma-1800Ma) metamorphic rocks (undivided metasedimentary, metavolcanic, and gneissic rocks), and that's consistent with what I can see in the GigaPan. In addition to the dark-colored metamorphic rocks that make up the bulk of this roadcut, there is a light-colored rock near the top that is most likely granite, an intrusive igneous rock. There may also be other darker intrusive igneous rocks (based on crosscutting relations I think I'm seeing), but I'd have to examine it up close, in situ, to be sure. Broadly speaking, these rocks are of the same age and rock type as those in the inner gorge of the Grand Canyon, and represent an important stage of the growth of the North American continent (known as Laurentia in this time frame). They are about 1/3 of the age of the Earth. I'll try to add other annotations as snapshots.

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Stitcher Notes

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GigaPan Stitch.Efx version 2.3.0306 (Macintosh)
Panorama size: 6552 megapixels (172776 x 37924 pixels)
Input images: 969 (57 columns by 17 rows)
Field of view: 135.0 degrees wide by 29.6 degrees high (top=21.9, bottom=-7.8)
Settings:
Vignette correction on: c1=0.00246 c2=-0.00364
Use BRISK feature detector
Original image properties:
Camera make: Canon
Camera model: Canon EOS REBEL T2i
Image size: 5184x3456 (17.9 megapixels)
Capture time: 2014-03-30 12:39:41 - 2014-03-30 13:31:27
Aperture: f/18
Exposure time: 0.005
ISO: 400
Focal length (35mm equiv.): 471.8 mm
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 39.9 to 47.0 percent
Vertical overlap: 34.1 to 40.7 percent
Computer stats: 24576 MB RAM, 4 CPUs but using at most 1
Total time 2:05:04 (7.7 seconds per picture)
Alignment: 53:25, Projection: 8:40, Blending: 1:02:58
(Preview finished in 1:11:22)

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