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Callan Bentley's Snapshots

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  1. Sample collected here

    Snapshot Title: Sample collected here
    Taken by: Callan Bentley

    Image: Ball and pillow
    Image Owner: Callan Bentley



    Description:

    :)



  2. Square hole

    Snapshot Title: Square hole
    Taken by: Callan Bentley

    Image: Mudcracks from the Belt Supergroup
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Suspiciously square shaped... former halite cast? or just geo-pareidolia?



  3. Book return

    Snapshot Title: Book return
    Taken by: Callan Bentley

    Image: Fort Valley Community Center and Library
    Image Owner: Callan Bentley



    Description:

    Drop box!



  4. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ash and Lapilli from Kilbourne Hole
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Petri dish diameter is 9 cm.



  5. Laminations

    Snapshot Title: Laminations
    Taken by: Callan Bentley

    Image: Witvlei Group Stromatolites
    Image Owner: Callan Bentley



    Description:

    Microbial mats growing upward (toward sunlight) give this rock its distinctive "onion-skin" domes.



  6. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Witvlei Group Stromatolites
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm long.



  7. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample of graywacke collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  8. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample of graywacke collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  9. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Folded calc-silicate
    Image Owner: Callan Bentley



    Description:

    This bar is 1 centimeter long.



  11. P-sol

    Snapshot Title: P-sol
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Pressure solution here?
    Garnet porphyroblast impinging on quartz ribbon below it.



  12. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Porphyroblast with reaction rim.



  13. Tailed porphyroclast

    Snapshot Title: Tailed porphyroclast
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Quartz-feldspar domain with "tails" along the plane of foliation.



  14. Tailed porphyroclast

    Snapshot Title: Tailed porphyroclast
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Slight asymmetry; top to the left sense of shear?



  15. Tailed porphyroclast

    Snapshot Title: Tailed porphyroclast
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Garnet with reaction rim and amphibolitic tails on each side.



  16. Squirrels

    Snapshot Title: Squirrels
    Taken by: Callan Bentley

    Image: House, viewed from the west, looking east
    Image Owner: Callan Bentley



    Description:

    eating spilled birdseed



  17. Tufted titmouse

    Snapshot Title: Tufted titmouse
    Taken by: Callan Bentley

    Image: House, viewed from the west, looking east
    Image Owner: Callan Bentley



    Description:

    eating sunflower seed



  18. Male downy woodpecker

    Snapshot Title: Male downy woodpecker
    Taken by: Callan Bentley

    Image: House, viewed from the west, looking east
    Image Owner: Callan Bentley



    Description:

    On suet feeder



  19. Grain boundaries impinging

    Snapshot Title: Grain boundaries impinging
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Clear evidence of pressure solution. Also note the other grains along strike to the right.



  20. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This is 1 centimeter.



  21. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This pebble (green) has a weathering rind (brown).



  22. Bedding

    Snapshot Title: Bedding
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This pebble contains pre-existing (i.e., pre-pebble-ification) layering.



  23. Grain boundaries

    Snapshot Title: Grain boundaries
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    One grain (green) impinges on its neighbor (brown). P-sol!



  24. P-sol

    Snapshot Title: P-sol
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Another set of grain truncations that suggests strain accomplished via pressure solution.



  25. More truncated grain boundaries

    Snapshot Title: More truncated grain boundaries
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Evidence of pressure solution.



  26. Suture

    Snapshot Title: Suture
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Pressure solution!



  27. Piece of sandstone

    Snapshot Title: Piece of sandstone
    Taken by: Callan Bentley

    Image: Head of Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    The Flathead Sandstone unconformably overlies the schist and granite of the Archean basement complex at this site. Explore the sandstone close-up in this macro GigaPan of a small sample from this site...



  28. Piece of sandstone

    Snapshot Title: Piece of sandstone
    Taken by: Callan Bentley

    Image: Great Unconformity, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Explore the Flathead Sandstone close-up in this macro GigaPan of a small sample from this site: www.gigapan.com/gigapans/143007



  29. Piece of sandstone

    Snapshot Title: Piece of sandstone
    Taken by: Callan Bentley

    Image: Great Unconformity, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Explore the Flathead Sandstone close-up in this macro GigaPan of a small sample from this site: www.gigapan.com/gigapans/143007



  30. Piece of granite

    Snapshot Title: Piece of granite
    Taken by: Callan Bentley

    Image: Great Unconformity, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Explore a specimen of granite from this site in detail with this macro GigaPan: www.gigapan.com/gigapans/143006



  31. Piece of granite

    Snapshot Title: Piece of granite
    Taken by: Callan Bentley

    Image: Great Unconformity, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Explore a specimen of granite from this site in detail with this macro GigaPan: www.gigapan.com/gigapans/143006



  32. Piece of granite

    Snapshot Title: Piece of granite
    Taken by: Callan Bentley

    Image: Head of Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Explore a sample of granite from this site in more detail in this macro GigaPan: www.gigapan.com/gigapans/143006



  33. Conchoidal fracture

    Snapshot Title: Conchoidal fracture
    Taken by: Callan Bentley

    Image: Granite, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Showing this gray mineral to be quartz.



  34. Graphic

    Snapshot Title: Graphic
    Taken by: Callan Bentley

    Image: Granite, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    A little bit of "graphic granite" quartz / potassium feldspar intergrowth.



  35. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Granite, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    This is 1 centimeter.



  36. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Flathead Sandstone, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    This is 1 centimeter.



  37. Roundness

    Snapshot Title: Roundness
    Taken by: Callan Bentley

    Image: Flathead Sandstone, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    Check out how well-rounded these sand grains are - aeolian modification of the grains before eventual deposition in seawater?



  38. Halite casts

    Snapshot Title: Halite casts
    Taken by: Callan Bentley

    Image: Halite Casts
    Image Owner: Callan Bentley



    Description:

    These cubic shapes are casts of halite (salt) crystals that formed under hypersaline conditions on a Devonian tidal flat. Once buried anew by rising tides, the salt crystals dissolved, and mud filled ...



  39. Piece of schist

    Snapshot Title: Piece of schist
    Taken by: Callan Bentley

    Image: Head of Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    To see a hand sample of schist from this site, check out this macro GigaPan:
    gigapan.com/gigapans/141715



  40. Piece of schist

    Snapshot Title: Piece of schist
    Taken by: Callan Bentley

    Image: Great Unconformity, Wind River Canyon, Wyoming
    Image Owner: Callan Bentley



    Description:

    To see a macro GigaPan of a sample of schist from this site, please check out this image: gigapan.com/gigapans/141715



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