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Charles Carrigan's Snapshots

  1. E Pluribus Unum

    Snapshot Title: E Pluribus Unum
    Taken by: Charles Carrigan

    Image: Hooper Garnet Mine (Detail)
    Image Owner: Ron Schott



    Description:

    detail on the quarter used for scale.



  2. Axial Planar Cleavage

    Snapshot Title: Axial Planar Cleavage
    Taken by: Charles Carrigan

    Image: Folded Wilhite Slate, Eastern TN
    Image Owner: Charles Carrigan



    Description:

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



  3. entrained xenolith cut by dike?

    Snapshot Title: entrained xenolith cut by dike?
    Taken by: Charles Carrigan

    Image: Mount Rushmore from Below
    Image Owner: Ron Schott



    Description:

    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...



  4. Cross-cutting dikes

    Snapshot Title: Cross-cutting dikes
    Taken by: Charles Carrigan

    Image: Mount Rushmore from Below
    Image Owner: Ron Schott



    Description:

    Pegmatite dikes crossing each other on Lincoln's nose.



  5. Numerous dikes

    Snapshot Title: Numerous dikes
    Taken by: Charles Carrigan

    Image: Mount Rushmore from Below
    Image Owner: Ron Schott



    Description:

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



  6. Dike into metamorphic rock

    Snapshot Title: Dike into metamorphic rock
    Taken by: Charles Carrigan

    Image: Mount Rushmore from Below
    Image Owner: Ron Schott



    Description:

    A granite dike cuts he metamorphic rock below Washington.



  7. visitors at the chin

    Snapshot Title: visitors at the chin
    Taken by: Charles Carrigan

    Image: Crazy Horse Volksmarch 2012
    Image Owner: Charles Carrigan



    Description:

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



  8. another of Ron's field companions

    Snapshot Title: another of Ron's field companions
    Taken by: Charles Carrigan

    Image: Geological Contact
    Image Owner: Ron Schott



    Description:

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



  9. another

    Snapshot Title: another
    Taken by: Charles Carrigan

    Image: Geological Contact
    Image Owner: Ron Schott



    Description:

    red hat, blue shirt.



  10. Found one!

    Snapshot Title: Found one!
    Taken by: Charles Carrigan

    Image: Geological Contact
    Image Owner: Ron Schott



    Description:

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



  11. chromite

    Snapshot Title: chromite
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

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



  12. plagioclase albite twinning

    Snapshot Title: plagioclase albite twinning
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

    a very common type of twinning seen in plagioclase feldspar.



  13. plagioclase carlsbad twin

    Snapshot Title: plagioclase carlsbad twin
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

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



  14. Great Smoky Thrust Fault

    Snapshot Title: Great Smoky Thrust Fault
    Taken by: Charles Carrigan

    Image: Great Smoky Thrust at White Oak Sink
    Image Owner: Charles Carrigan



    Description:

    Precambrian metamorphic rocks over Ordovician sedimentary limestone.



  15. tiny arms

    Snapshot Title: tiny arms
    Taken by: Charles Carrigan

    Image: Inside Stanley Field Hall – The Field Museum, Chicago.
    Image Owner: mj knelly



    Description:

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