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Callan Bentley's Snapshots

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  1. 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!



  2. 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.



  3. 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.



  4. 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.



  5. More detail

    Snapshot Title: More detail
    Taken by: Callan Bentley

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



    Description:

    This area is also covered (at closer range, with fewer trees) in another GigaPan:
    gigapan.com/gigapans/122629



  6. Fluids flowing...

    Snapshot Title: Fluids flowing...
    Taken by: Callan Bentley

    Image: Boxwork on Sandstone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    ...through an orthogonal set of cracks permeated into the surrounding sandstone, making it tougher than non-fluid-soaked sandstone. Later, weathering etched out the primary sandstone, but had a harder...



  7. Grallator

    Snapshot Title: Grallator
    Taken by: Callan Bentley

    Image: Therapod Tracks 2
    Image Owner: Alan Pitts



    Description:

    Three toes with pointy tips



  8. Recumbent antiforms and synform

    Snapshot Title: Recumbent antiforms and synform
    Taken by: Callan Bentley

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



    Description:

    Or is it synforms and antiforms?
    ...Depends on which way it got turned over. Based on the westward vergence of the rest of the structures here, I'm guessing 2 antiforms and a central synform.



  9. Squirrel nest??

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

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



    Description:

    I've never known squirrels to nest on cliffs rather than trees, but this looks like one of their leaf nests.



  10. Folding

    Snapshot Title: Folding
    Taken by: Callan Bentley

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



    Description:

    of a quartz vein



  11. Boudinage

    Snapshot Title: Boudinage
    Taken by: Callan Bentley

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



    Description:

    in a quartz vein



  12. Overturned synform

    Snapshot Title: Overturned synform
    Taken by: Callan Bentley

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



    Description:

    Awesome.



  13. Overturned synform

    Snapshot Title: Overturned synform
    Taken by: Callan Bentley

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



    Description:

    Great example of some of the structures to be seen in this highly-deformed portion of the Catoctin Formation.



  14. Parasitic folds

    Snapshot Title: Parasitic folds
    Taken by: Callan Bentley

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



    Description:

    Small scale folds in the hinge area of a larger (meso-scale) fold in the Catoctin greenstone's foliation.



  15. Funny

    Snapshot Title: Funny
    Taken by: Callan Bentley

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



    Description:

    The things you get with an auto-focus GigaPan! :)



  16. Boudin neck

    Snapshot Title: Boudin neck
    Taken by: Callan Bentley

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



    Description:

    Looks like some of the quartz veins were stretched under brittle-ductile conditions, depending on their orientation relative to the stress field.



  17. Kink band

    Snapshot Title: Kink band
    Taken by: Callan Bentley

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



    Description:

    The Catoctin greenstone's foliation (itself a product of metamorphism and deformation) is here seen to be kinked, meaning post-metamorphic deformation either under a lower temperature/pressure regime...



  18. Vein tip

    Snapshot Title: Vein tip
    Taken by: Callan Bentley

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



    Description:

    Astonishing variation in thickness over such a short distance - think of how flexible the greenstone would have to be to rip in this particular way.



  19. Vein tip

    Snapshot Title: Vein tip
    Taken by: Callan Bentley

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



    Description:

    From fat to nonexistent in a few inches!



  20. Intersection

    Snapshot Title: Intersection
    Taken by: Callan Bentley

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



    Description:

    of cleavage (moderately dipping to right) and joint set (steeply dipping to right).



  21. Tight to isoclinal folding

    Snapshot Title: Tight to isoclinal folding
    Taken by: Callan Bentley

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



    Description:

    of quartz veins within the Catoctin Formation.



  22. Cuspate-lobate folding

    Snapshot Title: Cuspate-lobate folding
    Taken by: Callan Bentley

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



    Description:

    The cusps of greenstone and broad lobes of the quartz vein suggest a marked viscosity contrast between the two units as folding occured. Sometimes the term "ptygmatic" (one of the greatest words in al...



  23. Cleavage

    Snapshot Title: Cleavage
    Taken by: Callan Bentley

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



    Description:

    dipping moderately to the east.



  24. Folded tension gashes

    Snapshot Title: Folded tension gashes
    Taken by: Callan Bentley

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



    Description:

    These fat, relatively-short veins show disharmonic cuspate/lobate folding. Their light color provides good contrast against the dark green of the Catoctin greenstone.



  25. Drill marks

    Snapshot Title: Drill marks
    Taken by: Callan Bentley

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



    Description:

    These subvertical features appear to be the drill holes associated with dynamite blasting - no doubt related to opening up space for the C&O Canal and/or the B&O Railroad during construction of that i...



  26. Snow

    Snapshot Title: Snow
    Taken by: Callan Bentley

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



    Description:

    Residual snow/ice on the cliffs.



  27. Veins

    Snapshot Title: Veins
    Taken by: Callan Bentley

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



    Description:

    Quartz veins are common features at this site, and some show evidence of post-emplacement deformation (folding).



  28. Cleavage & joints

    Snapshot Title: Cleavage & joints
    Taken by: Callan Bentley

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



    Description:

    Cleavage is the pervasive moderate-angle feature dipping to the right (east). The steeply-dipping, more widely-spaced features are a prominent joint set.



  29. Great white shark

    Snapshot Title: Great white shark
    Taken by: Callan Bentley

    Image: Aquarium
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Cruising death machine of the deep. Don't let him mistake your finger for a fur seal.



  30. Pillow basalts

    Snapshot Title: Pillow basalts
    Taken by: Callan Bentley

    Image: Aquarium
    Image Owner: Robin Rohrback-Schiavone



    Description:

    That must be some hot lava to still be incandescent so far from the submarine vent.



  31. Water gap

    Snapshot Title: Water gap
    Taken by: Callan Bentley

    Image: LIDAR Weverton Formation - Blue Ridge front, Virginia
    Image Owner: Callan Bentley



    Description:

    Drainage vs. structure. Drainage wins.



  32. Wow

    Snapshot Title: Wow
    Taken by: Callan Bentley

    Image: LIDAR Weverton Formation - Blue Ridge front, Virginia
    Image Owner: Callan Bentley



    Description:

    Dextrally asymmetric folds



  33. Z fold

    Snapshot Title: Z fold
    Taken by: Callan Bentley

    Image: LIDAR Weverton Formation - Blue Ridge front, Virginia
    Image Owner: Callan Bentley



    Description:

    Expressed as subtle topography



  34. What's wrong with this picture?

    Snapshot Title: What's wrong with this picture?
    Taken by: Callan Bentley

    Image: Passage Creek in Flood II
    Image Owner: Callan Bentley



    Description:

    : )



  35. Natural levee

    Snapshot Title: Natural levee
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    Defining the right bank of the stream



  36. Floodplains...

    Snapshot Title: Floodplains...
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    ...are for flooding!



  37. The road dives down

    Snapshot Title: The road dives down
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    On the far side of the creek, Spring Mountain Way splashes down into the floodplain.



  38. Flood debris

    Snapshot Title: Flood debris
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    Flotsam piled up on the upstream side of the bridge.



  39. The bridge

    Snapshot Title: The bridge
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    This set of rapids is due to our low-water bridge, suffering under high water.



  40. Normal width of the creek

    Snapshot Title: Normal width of the creek
    Taken by: Callan Bentley

    Image: Passage Creek in Flood I
    Image Owner: Callan Bentley



    Description:

    Between these 2 lines of trees.



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