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Callan Bentley's Snapshots

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  1. "Ploudin"

    Snapshot Title: "Ploudin"
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Boudin / Sag pillow from latest Devonian Spechty Kopf diamictite, Corridor H, West Virginia.



  2. Greenschist

    Snapshot Title: Greenschist
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Catoctin Formation



  3. Tempestite

    Snapshot Title: Tempestite
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Limestone, Devonian of West Virginia



  4. Arkose

    Snapshot Title: Arkose
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    from Culpeper Basin



  5. Cockeysville

    Snapshot Title: Cockeysville
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Marble



  6. Slickensides

    Snapshot Title: Slickensides
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    .



  7. Fault / vein

    Snapshot Title: Fault / vein
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Offset and extension (dilation)



  8. Stylolite "steps"

    Snapshot Title: Stylolite "steps"
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Pressure solution's signature



  9. Finer sediment

    Snapshot Title: Finer sediment
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Limy mud filling shell is significantly finer than that outside the shell.



  10. Geopetal

    Snapshot Title: Geopetal
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Yet another example for figuring out which way was up during the time of deposition.



  11. Faulted shell

    Snapshot Title: Faulted shell
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Offset and dilation



  12. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  13. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Small offset



  14. Geopetal

    Snapshot Title: Geopetal
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Another half-sediment-filled (lower half), half-sparry-calcite-cement-filled (upper half) shell.



  15. Partly sediment-filled shell

    Snapshot Title: Partly sediment-filled shell
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Geopetal structure - upper half of space is filled with sparry calcite.



  16. Fossilized lophophore

    Snapshot Title: Fossilized lophophore
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    gray material inside shell?



  17. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Blue bar is 1 cm wide.



  18. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    White/tan/pinkish and blocky



  19. Amphibole

    Snapshot Title: Amphibole
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    Black prisms



  20. 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.



  21. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Pink



  22. Quartz

    Snapshot Title: Quartz
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    gray to purple



  23. Epidote

    Snapshot Title: Epidote
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Green



  24. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    1 cm wide blue bar



  25. 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.



  26. 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



  27. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    1 cm wide bar



  28. 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!



  29. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

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



    Description:

    Euhedral porphyroblast



  30. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

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



    Description:

    1 cm wide bar



  31. 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.



  32. 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



  33. 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



  34. 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"



  35. Pyroxene?

    Snapshot Title: Pyroxene?
    Taken by: Callan Bentley

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



    Description:

    .



  36. 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.



  37. 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.



  38. Ostracode shell

    Snapshot Title: Ostracode shell
    Taken by: Callan Bentley

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



    Description:

    in cross-section



  39. Grading

    Snapshot Title: Grading
    Taken by: Callan Bentley

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



    Description:

    This bed is graded.



  40. 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.



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