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Callan Bentley's Snapshots

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  1. 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.



  2. 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.



  3. Faulted shell

    Snapshot Title: Faulted shell
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Offset and dilation



  4. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  5. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Small offset



  6. 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.



  7. 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.



  8. Fossilized lophophore

    Snapshot Title: Fossilized lophophore
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    gray material inside shell?



  9. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Blue bar is 1 cm wide.



  10. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    White/tan/pinkish and blocky



  11. Amphibole

    Snapshot Title: Amphibole
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    Black prisms



  12. 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.



  13. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Pink



  14. Quartz

    Snapshot Title: Quartz
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    gray to purple



  15. Epidote

    Snapshot Title: Epidote
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Green



  16. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    1 cm wide blue bar



  17. 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.



  18. 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



  19. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    1 cm wide bar



  20. 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!



  21. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

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



    Description:

    Euhedral porphyroblast



  22. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

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



    Description:

    1 cm wide bar



  23. 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.



  24. 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



  25. 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



  26. 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"



  27. Pyroxene?

    Snapshot Title: Pyroxene?
    Taken by: Callan Bentley

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



    Description:

    .



  28. 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.



  29. 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.



  30. Ostracode shell

    Snapshot Title: Ostracode shell
    Taken by: Callan Bentley

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



    Description:

    in cross-section



  31. Grading

    Snapshot Title: Grading
    Taken by: Callan Bentley

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



    Description:

    This bed is graded.



  32. 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.



  33. Calcite

    Snapshot Title: Calcite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback



    Description:

    Meta limestone!



  34. Chlorite

    Snapshot Title: Chlorite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback



    Description:

    Green color comes from chlorite



  35. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback



    Description:

    Porphyroblast



  36. Cavelet

    Snapshot Title: Cavelet
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    Little overhang.



  37. Area 4

    Snapshot Title: Area 4
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback



    Description:

    For student analysis.



  38. Area 3

    Snapshot Title: Area 3
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback



    Description:

    For student analysis.



  39. Area 2

    Snapshot Title: Area 2
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback



    Description:

    For student analysis.



  40. Area 1

    Snapshot Title: Area 1
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback



    Description:

    For student analysis.



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