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Callan Bentley's Snapshots

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  1. River gravel deposits

    Snapshot Title: River gravel deposits
    Taken by: Callan Bentley

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



    Description:

    How old? Maybe as much as Cretaceous, maybe much younger.



  2. Metagraywacke schist --> saprolite

    Snapshot Title: Metagraywacke schist --> saprolite
    Taken by: Callan Bentley

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



    Description:

    Ancient seafloor sediments transformed during the first phase of Appalachian mountain-building, then weathered to clay.



  3. Lichen

    Snapshot Title: Lichen
    Taken by: Callan Bentley

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



    Description:

    .



  4. Rugose coral

    Snapshot Title: Rugose coral
    Taken by: Callan Bentley

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



    Description:

    Cross-sectioned laterally.



  5. Trace

    Snapshot Title: Trace
    Taken by: Callan Bentley

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



    Description:

    The sign left a footprint and moved about 20 cm to the left...?



  6. Namesake

    Snapshot Title: Namesake
    Taken by: Callan Bentley

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



    Description:

    A great jazz musician



  7. Flint cobble

    Snapshot Title: Flint cobble
    Taken by: Callan Bentley

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



    Description:

    Derived from one of the limestones of the Shenandoah Valley's Cambro-Ordovician series?



  8. Coarse sandstone

    Snapshot Title: Coarse sandstone
    Taken by: Callan Bentley

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



    Description:

    .



  9. 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.



  10. 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.



  11. 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?



  12. 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?



  13. 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.



  14. 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.



  15. 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.



  16. 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



  17. 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



  18. 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.



  19. 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.



  20. 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



  21. American flag

    Snapshot Title: American flag
    Taken by: Callan Bentley

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



    Description:

    Blowing in the wind



  22. 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.



  23. 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



  24. 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.



  25. 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.



  26. 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!



  27. Junco

    Snapshot Title: Junco
    Taken by: Callan Bentley

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



    Description:

    in the tree



  28. Goldfinch

    Snapshot Title: Goldfinch
    Taken by: Callan Bentley

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



    Description:

    in the tree



  29. Tufted titmouse

    Snapshot Title: Tufted titmouse
    Taken by: Callan Bentley

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



    Description:

    on suet



  30. Goldfinch

    Snapshot Title: Goldfinch
    Taken by: Callan Bentley

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



    Description:

    in subdued winter plumage



  31. 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.



  32. 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.



  33. 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.



  34. 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)



  35. 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.



  36. 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.



  37. 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.



  38. 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.



  39. 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.



  40. 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.



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