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Callan Bentley's Snapshots

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  1. Channel form

    Snapshot Title: Channel form
    Taken by: Callan Bentley

    Image: Hampshire Formation, showing channel forms in cross section
    Image Owner: Callan Bentley



    Description:

    What happens to the thickness of this white unit as you go left? ... right?



  2. Badge

    Snapshot Title: Badge
    Taken by: Callan Bentley

    Image: Hampshire Formation, showing channel forms in cross section
    Image Owner: Callan Bentley



    Description:

    He's a hardy sort of sheriff!



  3. Hardy County Sheriff

    Snapshot Title: Hardy County Sheriff
    Taken by: Callan Bentley

    Image: Hampshire Formation, showing channel forms in cross section
    Image Owner: Callan Bentley



    Description:

    Calling in my vehicle on the CB radio...



  4. Ice

    Snapshot Title: Ice
    Taken by: Callan Bentley

    Image: Hampshire Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Groundwater leaking out at the surface, and then freezing.



  5. Vein

    Snapshot Title: Vein
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    A little brittle deformational overprint.



  6. Columnals

    Snapshot Title: Columnals
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    from the side w/ the little radial crenulations that make them like checkers.



  7. Columnal

    Snapshot Title: Columnal
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    stray from the matrix



  8. Arm drape

    Snapshot Title: Arm drape
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    Little (distal) one draped over top of big (basal) ones



  9. Calyx components

    Snapshot Title: Calyx components
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    .



  10. Pinnules

    Snapshot Title: Pinnules
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    All aligned; used for filter feeding.



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Crinoid fossil
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm wide.



  12. Sand grains

    Snapshot Title: Sand grains
    Taken by: Callan Bentley

    Image: Quartz pebble metaconglomerate (quartzite) of the Silurian Tuscarora Formation, West Virginia
    Image Owner: Callan Bentley



    Description:

    Boundaries of the grains highlighted with brown stuff - bioscuzz of some kind?



  13. Grain boundaries

    Snapshot Title: Grain boundaries
    Taken by: Callan Bentley

    Image: Quartz pebble metaconglomerate (quartzite) of the Silurian Tuscarora Formation, West Virginia
    Image Owner: Callan Bentley



    Description:

    The way the left pebble intrudes into the right pebble suggests pressure solution.



  14. Pebble

    Snapshot Title: Pebble
    Taken by: Callan Bentley

    Image: Quartz pebble metaconglomerate (quartzite) of the Silurian Tuscarora Formation, West Virginia
    Image Owner: Callan Bentley



    Description:

    Pebble of relatively transparent quartz



  15. 1 cm
  16. Parking lot

    Snapshot Title: Parking lot
    Taken by: Callan Bentley

    Image: LiDAR view of the Harpers Ferry region, West Virginia / Maryland / Virginia
    Image Owner: Callan Bentley



    Description:

    with restroom, maintained by the park.



  17. Sinkholes in Tomstown Formation

    Snapshot Title: Sinkholes in Tomstown Formation
    Taken by: Callan Bentley

    Image: LiDAR view of the Harpers Ferry region, West Virginia / Maryland / Virginia
    Image Owner: Callan Bentley



    Description:

    Bowl-shaped



  18. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Trace fossils in the Millboro Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm wide.



  19. Knocker

    Snapshot Title: Knocker
    Taken by: Callan Bentley

    Image: Slumped boulder (serpentinite colluvium), Marshall's Beach, San Francisco
    Image Owner: Callan Bentley



    Description:

    Resistant boulder freed from its matrix



  20. Colluvial strata exposed in scarp

    Snapshot Title: Colluvial strata exposed in scarp
    Taken by: Callan Bentley

    Image: Slumped boulder (serpentinite colluvium), Marshall's Beach, San Francisco
    Image Owner: Callan Bentley



    Description:

    Alternating colored bands represent colluvium and serpentinite soil horizons that were transected by this slump scarp.



  21. Slickensided serpentinite cobble

    Snapshot Title: Slickensided serpentinite cobble
    Taken by: Callan Bentley

    Image: Slumped boulder (serpentinite colluvium), Marshall's Beach, San Francisco
    Image Owner: Callan Bentley



    Description:

    Slippery to the touch



  22. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Slumped boulder (serpentinite colluvium), Marshall's Beach, San Francisco
    Image Owner: Callan Bentley



    Description:

    Here is a ballpoint pen, to give you a sense of how big things are.



  23. Linear features

    Snapshot Title: Linear features
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    iceberg drag marks?



  24. Striation?

    Snapshot Title: Striation?
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    A single linear groove can be seen on the surface of this black granular pebble - a possible glacial striation.



  25. Vein Quartz pebble

    Snapshot Title: Vein Quartz pebble
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    with apparent facets



  26. Elongate clast

    Snapshot Title: Elongate clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    Also granite



  27. Clast

    Snapshot Title: Clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    Outsized



  28. Granitic clast

    Snapshot Title: Granitic clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    Putative dropstone



  29. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite
    Image Owner: Callan Bentley



    Description:

    1 cm long



  30. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Corona Heights Fault, San Francisco
    Image Owner: Callan Bentley



    Description:

    Pencil for scale



  31. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Corona Heights Fault, San Francisco
    Image Owner: Callan Bentley



    Description:

    Pencil for scale



  32. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Corona Heights Fault, San Francisco
    Image Owner: Callan Bentley



    Description:

    A sense of scale, both quantitative and qualitative, is provided by this pencil.



  33. Pencil for scale

    Snapshot Title: Pencil for scale
    Taken by: Callan Bentley

    Image: Corona Heights Fault, San Francisco
    Image Owner: Callan Bentley



    Description:

    1 cm black bars along the edge.



  34. Serpentinite melange outcrop

    Snapshot Title: Serpentinite melange outcrop
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    Check it out here:
    gigapan.com/gigapans/182359



  35. Pen

    Snapshot Title: Pen
    Taken by: Callan Bentley

    Image: Serpentinite melange, Marshall's Beach, San Francisco
    Image Owner: Callan Bentley



    Description:

    for scale



  36. Sand

    Snapshot Title: Sand
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    from Kirby Cove, here: gigapan.com/gigapans/125878



  37. Pillow basalts

    Snapshot Title: Pillow basalts
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    of Kirby Cove: www.gigapan.com/gigapans/125480



  38. Gull family

    Snapshot Title: Gull family
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    Needy juvenile leaning in to mom.



  39. Cormorants

    Snapshot Title: Cormorants
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    Preening



  40. Life on the edge

    Snapshot Title: Life on the edge
    Taken by: Callan Bentley

    Image: The Golden Gate
    Image Owner: Callan Bentley



    Description:

    These guys are both sitting on a boulder on a colluvial slope that might not be all that stable.



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