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Callan Bentley's Snapshots

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  1. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils (annotated)
    Image Owner: Callan Bentley



    Description:

    The official scale bar of the Virginia Department of Geology and Mineral Resources. Inchest at top, centimeters at the bottom.



  2. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Massanutten Sandstone with trace fossils
    Image Owner: Callan Bentley



    Description:

    Bedding parallel



  3. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils
    Image Owner: Callan Bentley



    Description:

    Bedding-parallel



  4. Shadow

    Snapshot Title: Shadow
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils
    Image Owner: Callan Bentley



    Description:

    of the GigaPan EPIC Pro



  5. Closer

    Snapshot Title: Closer
    Taken by: Callan Bentley

    Image: Massanutten Sandstone with trace fossils
    Image Owner: Callan Bentley



    Description:

    Another GigaPan was shot at closer range of this face. See it here: gigapan.com/gigapans/124277



  6. Scale pencil #2

    Snapshot Title: Scale pencil #2
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with centimeters marked on the side.



  7. Scale pencil #1

    Snapshot Title: Scale pencil #1
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with centimeters marked on the side.



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten sandstone slab with trace fossils
    Image Owner: Callan Bentley



    Description:

    The official scale bar of the Virginia Department of Geology and Mineral Resources. Inchest at top, centimeters at the bottom.



  9. Scale pencil

    Snapshot Title: Scale pencil
    Taken by: Callan Bentley

    Image: Massanutten Sandstone with trace fossils
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with centimeters marked on the side.



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten Sandstone with trace fossils
    Image Owner: Callan Bentley



    Description:

    The official scale bar of the Virginia Department of Geology and Mineral Resources. Inchest at top, centimeters at the bottom.



  11. Pencil cleavage

    Snapshot Title: Pencil cleavage
    Taken by: Callan Bentley

    Image: Outcrop at the intersection of Fort Valley Road and Ramsey Road, Fort Valley, Virginia
    Image Owner: Callan Bentley



    Description:

    Shale/slate splitting equally well along bedding and cleavage, dividing the rock up into rods.



  12. Bedding traces

    Snapshot Title: Bedding traces
    Taken by: Callan Bentley

    Image: Outcrop at the intersection of Fort Valley Road and Ramsey Road, Fort Valley, Virginia
    Image Owner: Callan Bentley



    Description:

    Bedding here strikes southwest and dips shallowly to the northwest.



  13. Scale pencil

    Snapshot Title: Scale pencil
    Taken by: Callan Bentley

    Image: Outcrop at the intersection of Fort Valley Road and Ramsey Road, Fort Valley, Virginia
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with centimeters marked on the side.



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Outcrop at the intersection of Fort Valley Road and Ramsey Road, Fort Valley, Virginia
    Image Owner: Callan Bentley



    Description:

    The official scale bar of the Virginia Department of Geology and Mineral Resources. Inchest at top, centimeters at the bottom.



  15. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Martinsburg Formation, Millner Road and Bethel Road, Shenandoah County, Virginia
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with centimeters marked along the side.



  16. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Martinsburg Formation, Millner Road (near Deer Rapids Road), Shenandoah County, Virginia
    Image Owner: Callan Bentley



    Description:

    Pencil with cm demarcations on the side.



  17. Nice little antiform.

    Snapshot Title: Nice little antiform.
    Taken by: Callan Bentley

    Image: Folds and Faults in Foreknobs, Bergton Va
    Image Owner: Alan Pitts



    Description:

    Are these folds all associated with the overriding fault?



  18. Nucleus

    Snapshot Title: Nucleus
    Taken by: Callan Bentley

    Image: Ooids
    Image Owner: Robin Rohrback-Schiavone



    Description:

    A dark nucleus can be seen at the center of this broken ooid. Layers of CaCO3 wrap around it.



  19. Great White Ooid

    Snapshot Title: Great White Ooid
    Taken by: Callan Bentley

    Image: Ooids
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Why's this one so sparkling white?



  20. Cracked eggshell

    Snapshot Title: Cracked eggshell
    Taken by: Callan Bentley

    Image: Ooids
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This ooid has broken open, revealing its interior concentric layering.



  21. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

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



    Description:

    The fault is about here, dipping from upper right diagonally toward the lower left.



  22.  Beech tree roots

    Snapshot Title: Beech tree roots
    Taken by: Callan Bentley

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



    Description:

    Twisting through the saprolite.



  23. Hook

    Snapshot Title: Hook
    Taken by: Callan Bentley

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



    Description:

    Did an earlier explanatory sign hang here?



  24. Weathering of urbanite

    Snapshot Title: Weathering of urbanite
    Taken by: Callan Bentley

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



    Description:

    That's what concrete looks like if you leave it in DC humidity for 85 years.



  25. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

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



    Description:

    Pencil with centimeter markings on the side.



  26. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

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



    Description:

    trace fossils in this cobble of Antietam Formation.



  27. 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.



  28. 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.



  29. Lichen

    Snapshot Title: Lichen
    Taken by: Callan Bentley

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



    Description:

    .



  30. 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.



  31. 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...?



  32. 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



  33. 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?



  34. Coarse sandstone

    Snapshot Title: Coarse sandstone
    Taken by: Callan Bentley

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



    Description:

    .



  35. 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.



  36. 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.



  37. 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?



  38. 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?



  39. 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.



  40. 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.



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