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Callan Bentley's Snapshots

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  1. Cross bedding

    Snapshot Title: Cross bedding
    Taken by: Callan Bentley

    Image: Cross beds in komatiitic ash deposits
    Image Owner: Callan Bentley



    Description:

    Inclined lines are cross-laminations. Which way was the current flowing?



  2. Truncation

    Snapshot Title: Truncation
    Taken by: Callan Bentley

    Image: Cross beds in komatiitic ash deposits
    Image Owner: Callan Bentley



    Description:

    of cross beds by overlying massive bed.



  3. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Cross beds in komatiitic ash deposits
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm wide.



  4. Spinifex needles

    Snapshot Title: Spinifex needles
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Radiating out in a fan.



  5. Weathered spinifex

    Snapshot Title: Weathered spinifex
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    They show up nicely on the weathered surfaces.



  6. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Nice rusty exterior to these komatiites.



  7. Spinifex

    Snapshot Title: Spinifex
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Needlelike olivines in chandelier-like clusters.



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm wide.



  9. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Ultramafic lava isn't happy at Earth's surface.



  10. Spinifex

    Snapshot Title: Spinifex
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Olivine crystals



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Komatiite, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    1 cm wide black bars along the top.



  12. U-shaped valley

    Snapshot Title: U-shaped valley
    Taken by: Callan Bentley

    Image: Rift Valley, Iceland
    Image Owner: Callan Bentley



    Description:

    Evidently, a glacier once flowed through here.



  13. Lots of lava

    Snapshot Title: Lots of lava
    Taken by: Callan Bentley

    Image: Rift Valley, Iceland
    Image Owner: Callan Bentley



    Description:

    Stack after stack of basalt



  14. Inclination

    Snapshot Title: Inclination
    Taken by: Callan Bentley

    Image: Rift Valley, Iceland
    Image Owner: Callan Bentley



    Description:

    Dike? steep slope covered in lava?



  15. Fault?

    Snapshot Title: Fault?
    Taken by: Callan Bentley

    Image: Rift Valley, Iceland
    Image Owner: Callan Bentley



    Description:

    or just an apparent offset, reflective of a pre-eruptive landscape?



  16. Peekaboo!

    Snapshot Title: Peekaboo!
    Taken by: Callan Bentley

    Image: Goðafoss; upper gorge, Iceland.
    Image Owner: Callan Bentley



    Description:

    Covering up against the harsh Icelandic sun?



  17. Hordes

    Snapshot Title: Hordes
    Taken by: Callan Bentley

    Image: Goðafoss; lower gorge, Iceland.
    Image Owner: Callan Bentley



    Description:

    of tourists



  18. Photographer

    Snapshot Title: Photographer
    Taken by: Callan Bentley

    Image: Goðafoss; lower gorge, Iceland.
    Image Owner: Callan Bentley



    Description:

    Documenting the main falls.



  19. Person for scale

    Snapshot Title: Person for scale
    Taken by: Callan Bentley

    Image: Goðafoss; lower gorge, Iceland.
    Image Owner: Callan Bentley



    Description:

    Crossing the bridge



  20. Team GigaPan

    Snapshot Title: Team GigaPan
    Taken by: Callan Bentley

    Image: Goðafoss; lower gorge, Iceland.
    Image Owner: Callan Bentley



    Description:

    2/3 of them, anyhow.



  21. Van Sweet Van

    Snapshot Title: Van Sweet Van
    Taken by: Callan Bentley

    Image: Pseudocraters at Lake Mývatn, Iceland
    Image Owner: Callan Bentley



    Description:

    My home for the week.



  22. Sense of scale II

    Snapshot Title: Sense of scale II
    Taken by: Callan Bentley

    Image: Pseudocraters at Lake Mývatn, Iceland
    Image Owner: Callan Bentley



    Description:

    Another person to provide a scale calibration.



  23. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Pseudocraters at Lake Mývatn, Iceland
    Image Owner: Callan Bentley



    Description:

    Inadvertent field assistants.



  24. Example label

    Snapshot Title: Example label
    Taken by: Callan Bentley

    Image: Red cross-beds (annotated)
    Image Owner: Callan Bentley



    Description:

    Showing sites where older cross-beds are truncated against the bottom of younger beds.



  25. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Red cross-beds (annotated)
    Image Owner: Callan Bentley



    Description:

    Black bar is 1 cm in width



  26. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Komatiitic ash (meteorite impact layer), Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm wide.



  27. Longitudinal fractures

    Snapshot Title: Longitudinal fractures
    Taken by: Callan Bentley

    Image: Spinifex texture in komatiite, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    Cutting across the crystals orthogonal to their long axis (shortest distance required to break them).



  28. Spinifex

    Snapshot Title: Spinifex
    Taken by: Callan Bentley

    Image: Spinifex texture in komatiite, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    Nice diverging "V" shape seen here.



  29. Relatively fresh surface

    Snapshot Title: Relatively fresh surface
    Taken by: Callan Bentley

    Image: Spinifex texture in komatiite, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    To contrast with the rest of the sample.



  30. One cm

    Snapshot Title: One cm
    Taken by: Callan Bentley

    Image: Spinifex texture in komatiite, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    Tall



  31. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Differential Weathering, Sideling Hill, Maryland
    Image Owner: Marissa Dudek



    Description:

    Field notebook for scale.



  32. Double trouble

    Snapshot Title: Double trouble
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, Sideling Hill, Maryland
    Image Owner: Marissa Dudek



    Description:

    Two outsized clasts in close proximity.



  33. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, Sideling Hill, Maryland
    Image Owner: Marissa Dudek



    Description:

    Mechanical pencil w/ 1-cm markings



  34. Outsized clast

    Snapshot Title: Outsized clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, Sideling Hill, Maryland
    Image Owner: Marissa Dudek



    Description:

    Big chunk 'floating' in the clay-rich matrix.



  35. Outsized clast

    Snapshot Title: Outsized clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, Sideling Hill, Maryland
    Image Owner: Marissa Dudek



    Description:

    Big chunk in the clay-rich matrix



  36. Eutaxitic lens

    Snapshot Title: Eutaxitic lens
    Taken by: Callan Bentley

    Image: Huckleberry Ridge Tuff, Madison Valley, Montana
    Image Owner: Callan Bentley



    Description:

    Squashed blob of frothy pumice.



  37. Compaction

    Snapshot Title: Compaction
    Taken by: Callan Bentley

    Image: Huckleberry Ridge Tuff, Madison Valley, Montana
    Image Owner: Callan Bentley



    Description:

    Eutaxitic lens wrapping around the top of a stiff phenocryst.



  38. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Huckleberry Ridge Tuff, Madison Valley, Montana
    Image Owner: Callan Bentley



    Description:

    This is 1 cm tall.



  39. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Portrush: hornfels (contact metamorphosed Lias shale) above Portrush gabbroic/doleritic sill
    Image Owner: Callan Bentley



    Description:

    Black bars on the side of this pencil are each 1 cm long.



  40. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Portrush: hornfels (contact metamorphosed Lias shale) above Portrush gabbroic/doleritic sill
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil w/ 1-cm black bars along its side.



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