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Callan Bentley's Snapshots

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  1. Preferred alignment of grains

    Preferred alignment of grains by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    Long axes all point to upper right.

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  2. Nubbin og a quartz vein

    Nubbin og a quartz vein by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    Just a tiny fragment left sticking to the edge of the sample.

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  3. P sol & empty space

    P sol & empty space by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    Lovely example of a stack of sutured grains running from upper left towards lower right; empty space along strike both to the upper right and lower left of that. Strain pattern here appears to broadly mimic a map view of the Appalachian Mountains! Sweet, and we didn't even try!

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  4. Sutured grains

    Sutured grains by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    Maximum stress oriented from upper left toward bottom right; note also the open gaps in the spaces between the grains in an upper right towards lower left direction...

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  5. Rusty pancake

    Rusty pancake by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    with a dollop of quartz on top

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  6. Sutured grain boundaries

    Sutured grain boundaries by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    P sol!

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  7. Outsized grain

    Outsized grain by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    This thing is a pebble! Bigger than the rest of this otherwise well-sorted sample.

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  8. Preferred alignment of grains

    Preferred alignment of grains by Callan Bentley from the GigaPan Strained Antietam Formation by Callan Bentley

    Perhaps due to pressure solution?

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  9. Hiker

    Hiker by Callan Bentley from the GigaPan Seneca Rocks by Alan Pitts

    Headed for the hills!

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  10. Sign, sign...

    Sign, sign... by Callan Bentley from the GigaPan Seneca Rocks by Alan Pitts

    ...everywhere a sign.

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  11. Fishermen

    Fishermen by Callan Bentley from the GigaPan Seneca Rocks by Alan Pitts

    .

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  12. Observation deck

    Observation deck by Callan Bentley from the GigaPan Seneca Rocks by Alan Pitts

    Reward for the hikers who are tough enough to get to the top, but not comfortable enough with heights to go walking out onto the upright bedding of the Rocks.

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  13. Couple of vultures

    Couple of vultures by Callan Bentley from the GigaPan Seneca Rocks by Alan Pitts

    ? I think?

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  14. Interesting cobble

    Interesting cobble by Callan Bentley from the GigaPan "Rocks of Virginia" garden at the DGMR by Callan Bentley

    It has stripes, and that is very important!

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  15. Sample number

    Sample number by Callan Bentley from the GigaPan Coloeptera 1030b by Robin Rohrback-Schiavone

    1030B

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  16. Antennae

    Antennae by Callan Bentley from the GigaPan Coloeptera 1030b by Robin Rohrback-Schiavone

    segments visible!

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  17. Little abdomen

    Little abdomen by Callan Bentley from the GigaPan Coloeptera 1030b by Robin Rohrback-Schiavone

    of something...

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  18. What is this critter?

    What is this critter? by Callan Bentley from the GigaPan Coloeptera 1030b by Robin Rohrback-Schiavone

    Seems to have a very big head...

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  19. Bonus wasp

    Bonus wasp by Callan Bentley from the GigaPan Coloeptera 1030b by Robin Rohrback-Schiavone

    A little something extra, revealed by the GigaPan!

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  20. Ooid

    Ooid by Callan Bentley from the GigaPan Snowball Earth Eduational Rock Sample Suite TS-7 by Robin Rohrback-Schiavone

    This grain contains concentrically zoned spherical grains! Are they ooids?

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  21. Weird color difference

    Weird color difference by Callan Bentley from the GigaPan Snowball Earth Educational Rock Sample Suite TS-12 by Robin Rohrback-Schiavone

    What's up with that?

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  22. Dropstone

    Dropstone by Callan Bentley from the GigaPan Snowball Earth Educational Rock Sample Suite TS-12 by Robin Rohrback-Schiavone

    .

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  23. Cross bedding

    Cross bedding by Callan Bentley from the GigaPan Snowball Earth Educational Rock Sample Suite TS-12 by Robin Rohrback-Schiavone

    current flow to the right

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  24. Oblique fracture taking advantage of horizontal joint set

    Oblique fracture taking advantage of horizontal joint set by Callan Bentley from the GigaPan Conway Robinson State Forest- Diabase by Alan Pitts

    ...creating jagged zig zag staircase effect.

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  25. Sea urchin spine?

    Sea urchin spine? by Callan Bentley from the GigaPan Sand from Miami, FL, USA by Robin Rohrback-Schiavone

    .

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  26. Biotite cluster surrounding...

    Biotite cluster surrounding... by Callan Bentley from the GigaPan Granitic dikes in granite by Callan Bentley

    ... something green?

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  27. Easter egg

    Easter egg by Callan Bentley from the GigaPan Sand from Virginia Beach, Virginia by Robin Rohrback-Schiavone

    Well-rounded grain

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  28. Curved columns

    Curved columns by Callan Bentley from the GigaPan Bishop Tuff in the Owens Gorge by ahochstaedter

    Columnar jointing of welded tuff

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  29. Leaf

    Leaf by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    A little brown leaf - something native to the eastern slopes of the Sierra Nevada, presumably.

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  30. Lint

    Lint by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    a stray fiber, probably not native to the sample

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  31. Hornblende

    Hornblende by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    Just a little guy, part of a bigger lithic clast dominated by quartz.

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  32. Feldspar

    Feldspar by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    .

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  33. Feldpsar

    Feldpsar by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    Boxy, angular shape from 2 planes of cleavage more or less at right angles.

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  34. Lithic clast

    Lithic clast by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    A little chunk of rock (multiple mineral crystals in a single particle of sediment).

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  35. Organic bits

    Organic bits by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    From some of the native scrubby vegetation, no doubt.

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  36. Quartz

    Quartz by Callan Bentley from the GigaPan Grus by Robin Rohrback-Schiavone

    Conchoidal fracture visible.

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  37. What are these?

    What are these? by Callan Bentley from the GigaPan fold structure in Big Bend National Park (Texas) by minidani

    Bedfroms? Boudins? Stromatolites?

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  38. Another nice little fault

    Another nice little fault by Callan Bentley from the GigaPan fold structure in Big Bend National Park (Texas) by minidani

    .

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  39. Reduction

    Reduction by Callan Bentley from the GigaPan fold structure in Big Bend National Park (Texas) by minidani

    Reduction spots and joint highlighting

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  40. Joint

    Joint by Callan Bentley from the GigaPan fold structure in Big Bend National Park (Texas) by minidani

    or vein

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