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Callan Bentley's Snapshots

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  1. Sandstone pebble

    Snapshot Title: Sandstone pebble
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    You can see the grains inside it.



  2. Flush grain boundaries

    Snapshot Title: Flush grain boundaries
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    Evidence of pressure solution



  3. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    Scale



  4. Phenocryst

    Snapshot Title: Phenocryst
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Quartz (note the conchoidal fracture).



  5. Lithic

    Snapshot Title: Lithic
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Fragment of pre-existing rock, caught up in the pyroclastic surge.



  6. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This box is 1 cm wide.



  7. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Rockfish Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    To see a piece of the Catoctin greenstone from this site in "macro" GigaPan view, click here: gigapan.com/gigapans/149431



  8. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Rockfish Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    To see a piece of the Catoctin greenstone from this site in "macro" GigaPan view, click here: gigapan.com/gigapans/149431



  9. 1 cm Scale

    Snapshot Title: 1 cm Scale
    Taken by: Callan Bentley

    Image: Chip suite, El Paso region geology
    Image Owner: Callan Bentley



    Description:

    This box is 1 centimeter across



  10. Partly lithified cluster

    Snapshot Title: Partly lithified cluster
    Taken by: Callan Bentley

    Image: Coarse Ooids
    Image Owner: Robin Rohrback-Schiavone



    Description:

    oolitic limestone in the making.



  11. Pyrite

    Snapshot Title: Pyrite
    Taken by: Callan Bentley

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



    Description:

    Small pyrite crystal, surrounded by a rusty aura.



  12. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ball and pillow
    Image Owner: Callan Bentley



    Description:

    This is 1 cm long.



  13. Sample collected here

    Snapshot Title: Sample collected here
    Taken by: Callan Bentley

    Image: Ball and pillow
    Image Owner: Callan Bentley



    Description:

    :)



  14. 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?



  15. Book return

    Snapshot Title: Book return
    Taken by: Callan Bentley

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



    Description:

    Drop box!



  16. 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.



  17. 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.



  18. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Witvlei Group Stromatolites
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm long.



  19. 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



  20. 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



  21. 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



  22. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Folded calc-silicate
    Image Owner: Callan Bentley



    Description:

    This bar is 1 centimeter long.



  23. 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.



  24. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Hibriten Mylonite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Porphyroblast with reaction rim.



  25. 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.



  26. 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?



  27. 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.



  28. Squirrels

    Snapshot Title: Squirrels
    Taken by: Callan Bentley

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



    Description:

    eating spilled birdseed



  29. 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



  30. 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



  31. 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.



  32. 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.



  33. 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).



  34. 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.



  35. 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!



  36. 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.



  37. 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.



  38. Suture

    Snapshot Title: Suture
    Taken by: Callan Bentley

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



    Description:

    Pressure solution!



  39. 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...



  40. 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



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