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Callan Bentley's Snapshots

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  1. Plagioclase

    Snapshot Title: Plagioclase
    Taken by: Callan Bentley

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



    Description:

    feldspar



  2. Vesicle

    Snapshot Title: Vesicle
    Taken by: Callan Bentley

    Image: Porphyritic Vesicular Basalt from Ka Lae, Hawaii
    Image Owner: Callan Bentley



    Description:

    Hole from degassing



  3. Olivine

    Snapshot Title: Olivine
    Taken by: Callan Bentley

    Image: Porphyritic Vesicular Basalt from Ka Lae, Hawaii
    Image Owner: Callan Bentley



    Description:

    .



  4. Gneiss

    Snapshot Title: Gneiss
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Collection location unknown.



  5. Mudcracks

    Snapshot Title: Mudcracks
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Silurian-aged Tonoloway Formation carbonates, old quarry on old Route 55, West Virginia. Close-up of outcrop:
    gigapan.com/gigapans/90685



  6. Brachipods

    Snapshot Title: Brachipods
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    In Oriskany Formation standstone, Corridor H, West Virginia



  7. Quartzite

    Snapshot Title: Quartzite
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Weverton Formation, Thoroughfare Gap, Virginia.



  8. Plant fossils

    Snapshot Title: Plant fossils
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Pennsylvanian-aged Allegheny Formation, edge of Appalachian Plateau, Corridor H, West Virginia.



  9. Bedding / cleavage

    Snapshot Title: Bedding / cleavage
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Widely-spaced cleavage cutting-across bedding in Devonian-aged Helderberg limestone, Corridor H, West Virginia.



  10. Sag pillow

    Snapshot Title: Sag pillow
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Sandstone "ball and pillow" structure from redbeds of Devonian Hampshire Formation, Corridor H, West Virginia. Close-up:
    www.gigapan.com/gigapans/146668



  11. "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.



  12. Greenschist

    Snapshot Title: Greenschist
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Catoctin Formation



  13. Tempestite

    Snapshot Title: Tempestite
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Limestone, Devonian of West Virginia



  14. Arkose

    Snapshot Title: Arkose
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    from Culpeper Basin



  15. Cockeysville

    Snapshot Title: Cockeysville
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    Marble



  16. Slickensides

    Snapshot Title: Slickensides
    Taken by: Callan Bentley

    Image: Rock Garden
    Image Owner: Callan Bentley



    Description:

    .



  17. Fault / vein

    Snapshot Title: Fault / vein
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Offset and extension (dilation)



  18. Stylolite "steps"

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

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Pressure solution's signature



  19. 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.



  20. 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.



  21. Faulted shell

    Snapshot Title: Faulted shell
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Offset and dilation



  22. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  23. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Small offset



  24. 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.



  25. 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.



  26. Fossilized lophophore

    Snapshot Title: Fossilized lophophore
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    gray material inside shell?



  27. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Fossiliferous limestone
    Image Owner: Callan Bentley



    Description:

    Blue bar is 1 cm wide.



  28. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    White/tan/pinkish and blocky



  29. Amphibole

    Snapshot Title: Amphibole
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    Black prisms



  30. 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.



  31. Potassium feldspar

    Snapshot Title: Potassium feldspar
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Pink



  32. Quartz

    Snapshot Title: Quartz
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    gray to purple



  33. Epidote

    Snapshot Title: Epidote
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    Green



  34. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Unakite
    Image Owner: Callan Bentley



    Description:

    1 cm wide blue bar



  35. 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.



  36. 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



  37. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite
    Image Owner: Callan Bentley



    Description:

    1 cm wide bar



  38. 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!



  39. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

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



    Description:

    Euhedral porphyroblast



  40. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

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



    Description:

    1 cm wide bar



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