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Callan Bentley's Snapshots

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  1. Skulking scour

    Snapshot Title: Skulking scour
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Small scour with 1 or 2 internal cross-beds, hiding in the shadows....



  2. Bedding vs. cleavage

    Snapshot Title: Bedding vs. cleavage
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Bedding is shallowly dipping to the right (east), while cleavage is moderately dipping to the right (east). This relationship suggests the bedding is right-side-up (i.e., it has not been bodily flippe...



  3. Laminations

    Snapshot Title: Laminations
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Fine-scale layering is apparent in this outcrop.



  4. Overturned cross-beds?

    Snapshot Title: Overturned cross-beds?
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    These cross beds appear to have been sufficiently sheared (top to the left) that they were tectonically inverted.



  5. Cuspate/lobate folds?

    Snapshot Title: Cuspate/lobate folds?
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Along the base of the quartz-rich bed (top of the dark-mineral-rich bed), with axial planes that appear to be parallel (within the plane of this outcrop, anyhow) with the cleavage.



  6. ?????

    Snapshot Title: ?????
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Not sure what to make of this. Any ideas?



  7. ???

    Snapshot Title: ???
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    Are these cross-beds steeply inclined toward the east (indicating the sand was deposited by west-to-east directed currents)? Or is this cleavage differentially developed in a graded bed (more quartz s...



  8. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    A suite of cross-beds are preserved in scours within the quartzite here. While most indicate apparent east-to-west current flow, the set at upper right show the opposite. The tangential and truncated ...



  9. Trough-like scour

    Snapshot Title: Trough-like scour
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    A semi-circular white shape lined with dark minerals shows a current scour into pre-existing sedimentary layering prior to lithification. The asymmetry of these scours (western edge gently sloping rel...



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Weverton Formation atop Biscuit Mountain (Outdoor Lab)
    Image Owner: Callan Bentley



    Description:

    The black and yellow rectangles that run along the side of this pencil are each 1 centimeter in length.



  11. Bedding / cleavage

    Snapshot Title: Bedding / cleavage
    Taken by: Callan Bentley

    Image: Outcrop of Weverton Formation quartzite atop Biscuit Mountain, Pond Mountains (South of Thoroughfare Gap), Virginia
    Image Owner: Callan Bentley



    Description:

    Both bedding and foliation (weak cleavage) dip moderately to the east a this site, though the bedding dips more shallowly than the cleavage.



  12. Tafoni II

    Snapshot Title: Tafoni II
    Taken by: Callan Bentley

    Image: Outcrop of Weverton Formation quartzite atop Biscuit Mountain, Pond Mountains (South of Thoroughfare Gap), Virginia
    Image Owner: Callan Bentley



    Description:

    More tafoni on the vertical sides of these outcrops.



  13. Tafoni

    Snapshot Title: Tafoni
    Taken by: Callan Bentley

    Image: Outcrop of Weverton Formation quartzite atop Biscuit Mountain, Pond Mountains (South of Thoroughfare Gap), Virginia
    Image Owner: Callan Bentley



    Description:

    There are plenty of lovely examples of tafoni-style weathering in these outcrops, and opferkessel solution pans, too.



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Outcrop of Weverton Formation quartzite atop Biscuit Mountain, Pond Mountains (South of Thoroughfare Gap), Virginia
    Image Owner: Callan Bentley



    Description:

    Pencil with 1-centimeter black bars along the side.



  15. Mole Hill

    Snapshot Title: Mole Hill
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    An Eocene volcanic plug. Youngest volcanics on the east coast.



  16. Thoroughfare Gap

    Snapshot Title: Thoroughfare Gap
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    The Bull Run Mountains are breached here by Broad Run.



  17. Browntown Valley

    Snapshot Title: Browntown Valley
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    A "bite" taken out of the Blue Ridge front.



  18. Canaan Valley

    Snapshot Title: Canaan Valley
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    A high-elevation valley sometimes nicknamed "the Canadian Valley" for its volumnious winter snowstorms.



  19. Trellis

    Snapshot Title: Trellis
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    drainage pattern



  20. Veach Gap

    Snapshot Title: Veach Gap
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    Great anticlines exposed in here. For instance: gigapan.com/gigapans/98833



  21. Entrenched meanders

    Snapshot Title: Entrenched meanders
    Taken by: Callan Bentley

    Image: Physiography of the central Appalachians
    Image Owner: Callan Bentley



    Description:

    of the North Fork of the Shenandoah River.



  22. Better exposure?

    Snapshot Title: Better exposure?
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    I shot another GigaPan right after this one, and exposed it less, meaning that this area (South Page Valley) is more detailed and interesting:
    gigapan.com/gigapans/127564



  23. South Fork

    Snapshot Title: South Fork
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    of the Shenandoah River



  24. Page Valley

    Snapshot Title: Page Valley
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    I picked this exposure to bring out the details here in the South Page Valley. Roughly the same view can be seen in this more-exposed GigaPan:
    gigapan.com/gigapans/127565



  25. Sharp contact

    Snapshot Title: Sharp contact
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    My Swiss Rock Hammer deduces that the contact between the overlying Massanutten Sandstone and the underlying unit (presumably the upper Martinsburg Formation) is uncommonly sharp here.



  26. "The Knob"

    Snapshot Title: "The Knob"
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    A distinctive landform above Mt. Jackson, Virginia - distinctive and easy to spot from I-81.



  27. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    between Massanutten Sandstone and underlying rock unit (Cub Sandstone / upper Martinsburg?).



  28. The Knob

    Snapshot Title: The Knob
    Taken by: Callan Bentley

    Image: View SSW from Duncan Knob, George Washington National Forest, Virginia
    Image Owner: Callan Bentley



    Description:

    above Mt. Jasckson, Virginia



  29. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Contact between Fauquier Formation marble and Catoctin Formation greenstone, near Lime Kiln Road, Virginia
    Image Owner: Callan Bentley



    Description:

    Each black rectangle along the side of this pencil measures 1 centimeter in length.



  30. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Contact between Fauquier Formation marble and Catoctin Formation greenstone, near Lime Kiln Road, Virginia
    Image Owner: Callan Bentley



    Description:

    Each black rectangle along the side of this pencil is 1 centimeter in length.



  31. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Contact between Fauquier Formation marble and Catoctin Formation greenstone, near Lime Kiln Road, Virginia
    Image Owner: Callan Bentley



    Description:

    Each black rectangle along the side of this pencil is 1 centimeter in length.



  32. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Contact between Fauquier Formation marble and Catoctin Formation greenstone, near Lime Kiln Road, Virginia
    Image Owner: Callan Bentley



    Description:

    Each black rectangle is 1 cm long.



  33. Sign, sign

    Snapshot Title: Sign, sign
    Taken by: Callan Bentley

    Image: Chapman's Mill, Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Really: everywhere, a sign.



  34. Sign, sign

    Snapshot Title: Sign, sign
    Taken by: Callan Bentley

    Image: Chapman's Mill, Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Everywhere a sign.



  35. Plume

    Snapshot Title: Plume
    Taken by: Callan Bentley

    Image: Chapman's Mill, Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    This plumose structure shows joint propagation from right to left.



  36. Scale pencil

    Snapshot Title: Scale pencil
    Taken by: Callan Bentley

    Image: Chapman's Mill, Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Black bars are each one centimeter in length.



  37. Sand

    Snapshot Title: Sand
    Taken by: Callan Bentley

    Image: Calvert Formation, Scientists' Cliffs, Maryland (#3 of 8)
    Image Owner: Callan Bentley



    Description:

    Want to see a petri dish full of sand from this location in "macro" GigaPan view? Try this:
    gigapan.com/gigapans/126987



  38. Sand

    Snapshot Title: Sand
    Taken by: Callan Bentley

    Image: Calvert Formation, Scientists' Cliffs, Maryland (#2 of 8)
    Image Owner: Callan Bentley



    Description:

    Want to see a petri dish full of sand from this location in "macro" GigaPan view? Try this:
    gigapan.com/gigapans/126987



  39. Sand

    Snapshot Title: Sand
    Taken by: Callan Bentley

    Image: Calvert Formation, Scientists' Cliffs, Maryland (#8 of 8)
    Image Owner: Callan Bentley



    Description:

    Want to see a petri dish full of sand from this location in "macro" GigaPan view? Try this:
    gigapan.com/gigapans/126987



  40. Skyline Drive

    Snapshot Title: Skyline Drive
    Taken by: Callan Bentley

    Image: Rockfish Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Take this road north through Shenandoah National Park.



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