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Callan Bentley's Snapshots

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  1. Biotite

    Snapshot Title: Biotite
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    Brown, splitting along cleavage planes like the pages of a book.



  2. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Pink



  3. Quartz

    Snapshot Title: Quartz
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    gray to purple



  4. Epidote

    Snapshot Title: Epidote
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Green



  5. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    1 cm wide blue bar



  6. Two stages

    Snapshot Title: Two stages
    Taken by: Callan Bentley

    Image: Pisolites inTansil Formation limestone, Whites City, New Mexico
    Image Owner: Callan Bentley



    Description:

    An initial ~spherical pisolite was fractured into shards, and then one of those pieces was coated anew with calcite laminations to make this "blunt triangle" shape.



  7. Whole pisolite

    Snapshot Title: Whole pisolite
    Taken by: Callan Bentley

    Image: Pisolites inTansil Formation limestone, Whites City, New Mexico
    Image Owner: Callan Bentley



    Description:

    A full cross-section



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    1 cm wide bar



  9. Garnet exterior mold

    Snapshot Title: Garnet exterior mold
    Taken by: Callan Bentley

    Image: Garnetiferous schist, Wrangell, Alaska
    Image Owner: Callan Bentley



    Description:

    This one popped out!



  10. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Garnetiferous schist, Wrangell, Alaska
    Image Owner: Callan Bentley



    Description:

    Euhedral porphyroblast



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Garnetiferous schist, Wrangell, Alaska
    Image Owner: Callan Bentley



    Description:

    1 cm wide bar



  12. Aargh

    Snapshot Title: Aargh
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    Truck drove by, and the wind in its wake torqued my scale stick. Got it fixed before the next row, though.



  13. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    10 cm tall black bar



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    1 cm black bar



  15. Reaction rims

    Snapshot Title: Reaction rims
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    Like a little "necklace"



  16. Pyroxene?

    Snapshot Title: Pyroxene?
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    .



  17. Zoned feldspar

    Snapshot Title: Zoned feldspar
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    Zoning reflected as color differences in a single feldspar phenocryst: this reflects a changing magma composition.



  18. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    This horizontal bar is 1 cm long.



  19. Ostracode shell

    Snapshot Title: Ostracode shell
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    in cross-section



  20. Grading

    Snapshot Title: Grading
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    This bed is graded.



  21. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    This bar is 1 cm wide.



  22. Calcite

    Snapshot Title: Calcite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Meta limestone!



  23. Chlorite

    Snapshot Title: Chlorite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Green color comes from chlorite



  24. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Porphyroblast



  25. Cavelet

    Snapshot Title: Cavelet
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    Little overhang.



  26. Area 4

    Snapshot Title: Area 4
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  27. Area 3

    Snapshot Title: Area 3
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  28. Area 2

    Snapshot Title: Area 2
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  29. Area 1

    Snapshot Title: Area 1
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  30. Fern leaflet

    Snapshot Title: Fern leaflet
    Taken by: Callan Bentley

    Image: Plant Fossils in the Allegheny Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Neuropteris?



  31. Title

    Snapshot Title: Title
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    This is what you're looking at.



  32. Pro-talus rampart?

    Snapshot Title: Pro-talus rampart?
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    I think that's what this feature is.



  33. Person

    Snapshot Title: Person
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    contemplating Helen Lake



  34. Rockslide

    Snapshot Title: Rockslide
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    Fresh Gog quartzite is pinkish white. Older boulders get covered in black and green lichens.



  35. Tipover Trace?

    Snapshot Title: Tipover Trace?
    Taken by: Callan Bentley

    Image: Peach Tree Rock
    Image Owner: Joshua Benton



    Description:

    Is this damage from when the rock tipped over?



  36. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross section, original CaCO3 material remains (white), unlike most fossils in this rock, where it has been leached away to leave a mold.



  37. Shelly material

    Snapshot Title: Shelly material
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    At the heart of a carbonate (siderite) nodule, apparently



  38. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Nice example of how joint-facilitated fluid flow can alter a block of rock from the outside, in.



  39. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Nice example of how joint-facilitated fluid flow can alter a block of rock from the outside, in.



  40. Cactus "raisins"

    Snapshot Title: Cactus "raisins"
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    The Opuntia "beavertail" paddles are wrinkly during winter due to relative dessication during the winter months.



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