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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.