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Callan Bentley's Snapshots

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  1. Rugose coral in cross-section

    Snapshot Title: Rugose coral in cross-section
    Taken by: Callan Bentley

    Image: Indiana limestone at the Duke Ellington Bridge, D.C.
    Image Owner: Callan Bentley



    Description:

    Radial septae obvious even though it's a bit blurry.



  2. Skolithos trace fossil

    Snapshot Title: Skolithos trace fossil
    Taken by: Callan Bentley

    Image: Gravel deposits on Adams Mill Road NW, DC
    Image Owner: Callan Bentley



    Description:

    I ground-truthed this one. It's for real. A piece of the Antietam Formation.



  3. Beer can

    Snapshot Title: Beer can
    Taken by: Callan Bentley

    Image: Gravel deposits on Adams Mill Road NW, DC
    Image Owner: Callan Bentley



    Description:

    Guess what people use this patch of woods for?



  4. Visine bottle

    Snapshot Title: Visine bottle
    Taken by: Callan Bentley

    Image: Gravel deposits on Adams Mill Road NW, DC
    Image Owner: Callan Bentley



    Description:

    Guess what people use this patch of woods for?



  5. Sense of scale II

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

    Image: Gravel deposits on Adams Mill Road NW, DC
    Image Owner: Callan Bentley



    Description:

    Pencil, with centimeters marked along the side.



  6. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Gravel deposits on Adams Mill Road NW, DC
    Image Owner: Callan Bentley



    Description:

    Pencil, with centimeters marked along the side.



  7. Explanation

    Snapshot Title: Explanation
    Taken by: Callan Bentley

    Image: The Clydesdale Fault, D.C.
    Image Owner: Callan Bentley



    Description:

    This diagram shows the rock units offset along this fault in cartoon form.



  8. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Indiana limestone at the Duke Ellington Bridge, D.C.
    Image Owner: Callan Bentley



    Description:

    between weathered and washed limestone



  9. Bioturbation

    Snapshot Title: Bioturbation
    Taken by: Callan Bentley

    Image: Indiana limestone at the Duke Ellington Bridge, D.C.
    Image Owner: Callan Bentley



    Description:

    in skeletal limestone



  10. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Indiana limestone at the Duke Ellington Bridge, D.C.
    Image Owner: Callan Bentley



    Description:

    Pencil, with centimeters marked along the side.



  11. Glad for his windbreaker

    Snapshot Title: Glad for his windbreaker
    Taken by: Callan Bentley

    Image: Smithsonian Castle, Washington, DC
    Image Owner: Callan Bentley



    Description:

    It was blustery out that day.



  12. Xenolith

    Snapshot Title: Xenolith
    Taken by: Callan Bentley

    Image: Granite slab, Haupt Gardens, Smithsonian Instituion, Washington, DC
    Image Owner: Callan Bentley



    Description:

    mantled by K-spar



  13. American flag

    Snapshot Title: American flag
    Taken by: Callan Bentley

    Image: Smithsonian Castle, Washington, DC
    Image Owner: Callan Bentley



    Description:

    Blowing in the wind



  14. Cleavage

    Snapshot Title: Cleavage
    Taken by: Callan Bentley

    Image: Granite slab, Haupt Gardens, Smithsonian Instituion, Washington, DC
    Image Owner: Callan Bentley



    Description:

    on a potassium feldspar crystal - catching the sunlight at just the right angle.



  15. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Granite slab, Haupt Gardens, Smithsonian Instituion, Washington, DC
    Image Owner: Callan Bentley



    Description:

    cm-demarcated pencil



  16. Porcupine

    Snapshot Title: Porcupine
    Taken by: Callan Bentley

    Image: Monkeypuzzle tree, Haupt Gardens, Smithsonian Castle, Washington, DC
    Image Owner: Callan Bentley



    Description:

    Pretty much: you wouldn't want to rub the tip of this branch against your cheek.



  17. It's a puzzle for a monkey

    Snapshot Title: It's a puzzle for a monkey
    Taken by: Callan Bentley

    Image: Monkeypuzzle tree, Haupt Gardens, Smithsonian Castle, Washington, DC
    Image Owner: Callan Bentley



    Description:

    to figure out how to climb such a spiky tree.



  18. Little Adirondack chair

    Snapshot Title: Little Adirondack chair
    Taken by: Callan Bentley

    Image: Front Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    Baxter sized!



  19. Junco

    Snapshot Title: Junco
    Taken by: Callan Bentley

    Image: Front Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    in the tree



  20. Goldfinch

    Snapshot Title: Goldfinch
    Taken by: Callan Bentley

    Image: Front Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    in the tree



  21. Tufted titmouse

    Snapshot Title: Tufted titmouse
    Taken by: Callan Bentley

    Image: Front Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    on suet



  22. Goldfinch

    Snapshot Title: Goldfinch
    Taken by: Callan Bentley

    Image: Front Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    in subdued winter plumage



  23. Name of the GigaPanner

    Snapshot Title: Name of the GigaPanner
    Taken by: Callan Bentley

    Image: Side Yard, February 8, 2013
    Image Owner: Callan Bentley



    Description:

    and where he takes his car.



  24. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: LIDAR Weverton Formation - Blue Ridge front, Virginia with geologic map overlay
    Image Owner: Callan Bentley



    Description:

    with apparent left-lateral offset.



  25. Lovely folds

    Snapshot Title: Lovely folds
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Hinge thickened relative to thinned limbs.



  26. Folded quartz vein?

    Snapshot Title: Folded quartz vein?
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    (stained by iron oxides)



  27. Lovely folds

    Snapshot Title: Lovely folds
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    A few cm across.



  28. A relatively clean look

    Snapshot Title: A relatively clean look
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    At small-scale folding. This texture makes me think of the migmatite far downstream at the Billy Goat Trail.



  29. Scale 2

    Snapshot Title: Scale 2
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Rite in the Rain photo focus card.



  30. Typical looking Catoctin

    Snapshot Title: Typical looking Catoctin
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Foliated greenstone.



  31. Typical looking Catoctin

    Snapshot Title: Typical looking Catoctin
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Foliated greenstone.



  32. Scale 1

    Snapshot Title: Scale 1
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Swiss army knife.



  33. Harmonic crenulations

    Snapshot Title: Harmonic crenulations
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Very regular pattern of folding.



  34. Small scale folds

    Snapshot Title: Small scale folds
    Taken by: Callan Bentley

    Image: Fascinating Folded Float under Route 15 Bridge at Point of Rocks
    Image Owner: Chris Johnson



    Description:

    Clear layering present.



  35. Folds in the Weverton Formation

    Snapshot Title: Folds in the Weverton Formation
    Taken by: Callan Bentley

    Image: LIDAR Weverton Formation - Blue Ridge front, Virginia with geologic map overlay
    Image Owner: Callan Bentley



    Description:

    Well mapped in 1974 by Gathright and Nystrom, confirmed in 2013 by LiDAR.



  36. Small-scale folds

    Snapshot Title: Small-scale folds
    Taken by: Callan Bentley

    Image: Catoctin Metabasalt at Point of Rocks Maryland
    Image Owner: Chris Johnson



    Description:

    Deforming foliation in the Catoctin formation greenstone.



  37. Epidote pods

    Snapshot Title: Epidote pods
    Taken by: Callan Bentley

    Image: Catoctin Metabasalt at Point of Rocks Maryland
    Image Owner: Chris Johnson



    Description:

    Granny Smith apple green!



  38. Black vulture?

    Snapshot Title: Black vulture?
    Taken by: Callan Bentley

    Image: Exposure of Catoctin Metabasalt at Point of Rocks, Maryland
    Image Owner: Chris Johnson



    Description:

    The white patch on the underside of the far wing suggests this is a black vulture caught in mid-flap.



  39. Route 15

    Snapshot Title: Route 15
    Taken by: Callan Bentley

    Image: Exposure of Catoctin Metabasalt at Point of Rocks, Maryland
    Image Owner: Chris Johnson



    Description:

    This bridge takes Route 15 over the Potomac River in the stretch between Frederick, Maryland, and Leesburg, Virginia.



  40. Turkey vulture

    Snapshot Title: Turkey vulture
    Taken by: Callan Bentley

    Image: Exposure of Catoctin Metabasalt at Point of Rocks, Maryland
    Image Owner: Chris Johnson



    Description:

    A common bird to see gliding along in this region.



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