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Charles Carrigan's Snapshots

  1. E Pluribus Unum

    E Pluribus Unum by Charles Carrigan from the GigaPan Hooper Garnet Mine (Detail) by Ron Schott

    detail on the quarter used for scale.

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  2. Axial Planar Cleavage

    Axial Planar Cleavage by Charles Carrigan from the GigaPan Folded Wilhite Slate, Eastern TN by Charles Carrigan

    Prominent axial planar cleavage is abundant in this outcrop, and visible here.

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  3. entrained xenolith cut by dike?

    entrained xenolith cut by dike? by Charles Carrigan from the GigaPan Mount Rushmore from Below by Ron Schott

    This appears to be a patch of darker rock, possibly more mafic material or metamorphic rock such as the schist below the granite, that was caught up in the granite, but then later split by a pegmatite dike.

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  4. Cross-cutting dikes

    Cross-cutting dikes by Charles Carrigan from the GigaPan Mount Rushmore from Below by Ron Schott

    Pegmatite dikes crossing each other on Lincoln's nose.

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  5. Numerous dikes

    Numerous dikes by Charles Carrigan from the GigaPan Mount Rushmore from Below by Ron Schott

    A number of pegmatite dikes cutting through the granite on Jefferson's face.

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  6. Dike into metamorphic rock

    Dike into metamorphic rock by Charles Carrigan from the GigaPan Mount Rushmore from Below by Ron Schott

    A granite dike cuts he metamorphic rock below Washington.

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  7. visitors at the chin

    visitors at the chin by Charles Carrigan from the GigaPan Crazy Horse Volksmarch 2012 by Charles Carrigan

    Crazy Horse's chin being admired close up by visitors.

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  8. another of Ron's field companions

    another of Ron's field companions by Charles Carrigan from the GigaPan Geological Contact by Ron Schott

    red shirt; hope he lasts long enough to make it back to the ship after this excursion with the landing party.

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  9. another

    another by Charles Carrigan from the GigaPan Geological Contact by Ron Schott

    red hat, blue shirt.

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  10. Found one!

    Found one! by Charles Carrigan from the GigaPan Geological Contact by Ron Schott

    Edi? He's a red shirt, hope he makes it back to the ship!

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  11. chromite

    chromite by Charles Carrigan from the GigaPan Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland by Ian Butler

    euhedral, opaque grains of chromite (ideally FeCr2O4), a spinel group mineral.

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  12. plagioclase albite twinning

    plagioclase albite twinning by Charles Carrigan from the GigaPan Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland by Ian Butler

    a very common type of twinning seen in plagioclase feldspar.

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  13. plagioclase carlsbad twin

    plagioclase carlsbad twin by Charles Carrigan from the GigaPan Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland by Ian Butler

    a type of twinning common in plagioclase, the "carlsbad twin" is one where the grain is split down the middle.

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  14. Great Smoky Thrust Fault

    Great Smoky Thrust Fault by Charles Carrigan from the GigaPan Great Smoky Thrust at White Oak Sink by Charles Carrigan

    Precambrian metamorphic rocks over Ordovician sedimentary limestone.

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  15. tiny arms

    tiny arms by Charles Carrigan from the GigaPan Inside Stanley Field Hall – The Field Museum, Chicago. by mj knelly

    The arms of a T. rex are about the same size as a human's.

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