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Callan Bentley's Snapshots

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  1. 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).



  2. 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.



  3. 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.



  4. 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.



  5. 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.



  6. Wow

    Snapshot Title: Wow
    Taken by: Callan Bentley

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



    Description:

    Dextrally asymmetric folds



  7. 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



  8. 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:

    : )



  9. 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



  10. Floodplains...

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

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



    Description:

    ...are for flooding!



  11. 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.



  12. 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.



  13. 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.



  14. 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.



  15. Unique texture

    Snapshot Title: Unique texture
    Taken by: Callan Bentley

    Image: Keyser Limestone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This object seems to be unique in this sample in its finely-pebbled texture.



  16. Trilobite glabella?

    Snapshot Title: Trilobite glabella?
    Taken by: Callan Bentley

    Image: Keyser Limestone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Upside-down trilobite "nose"?



  17. Trilobite segment

    Snapshot Title: Trilobite segment
    Taken by: Callan Bentley

    Image: Keyser Limestone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This appears to be segment from the thorax of a trilobite ("rachis" + "pleura"??)



  18. Crinoid columnal and branching bryozoan

    Snapshot Title: Crinoid columnal and branching bryozoan
    Taken by: Callan Bentley

    Image: Keyser Limestone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Great detail - so small!



  19. Black thing

    Snapshot Title: Black thing
    Taken by: Callan Bentley

    Image: Keyser Limestone
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Any idea what this is?



  20. Massanutten Synclinorium

    Snapshot Title: Massanutten Synclinorium
    Taken by: Callan Bentley

    Image: A Tapestry of Time and Terrain
    Image Owner: Ron Schott



    Description:

    Purple blob is the surface expression of Silurian and Devonian sedimentary units, warped (along with surrounding pink-coded Cambrian and Ordovician units) into a large down-turned fold.



  21. Angular unconformity

    Snapshot Title: Angular unconformity
    Taken by: Callan Bentley

    Image: Grand Canyon from Lipan Point
    Image Owner: Richard Bahr



    Description:

    The signature of missing time.



  22. Angular grain

    Snapshot Title: Angular grain
    Taken by: Callan Bentley

    Image: Sand from Al Madam, Sharjah, UAE
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Looks like some proximal provenance as well as the distal source that produced the (now) rounded grains.



  23. Perfect sphere

    Snapshot Title: Perfect sphere
    Taken by: Callan Bentley

    Image: Sand from Al Madam, Sharjah, UAE
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Wow. That's rounding.



  24. Lithic clast?

    Snapshot Title: Lithic clast?
    Taken by: Callan Bentley

    Image: Volcaniclastic Breccia from Mount St. Helens
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Set amid the porph. ~andesite?



  25. Angular clasts

    Snapshot Title: Angular clasts
    Taken by: Callan Bentley

    Image: Volcaniclastic Breccia from Mount St. Helens
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Hence: it's a breccia.



  26. Agate

    Snapshot Title: Agate
    Taken by: Callan Bentley

    Image: Volcaniclastic Breccia from Mount St. Helens
    Image Owner: Robin Rohrback-Schiavone



    Description:

    precipitated in void spaces & lithifying the igneous clasts together into a breccia.



  27. Reaction rim?

    Snapshot Title: Reaction rim?
    Taken by: Callan Bentley

    Image: Volcaniclastic Breccia from Mount St. Helens
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This phenocryst seems to have triggered a reaction in the surrounding groundmass.



  28. Texture

    Snapshot Title: Texture
    Taken by: Callan Bentley

    Image: BGT amphibolite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    .



  29. Suet cage

    Snapshot Title: Suet cage
    Taken by: Callan Bentley

    Image: Snowy front yard, early Christmas morning 2012
    Image Owner: Callan Bentley



    Description:

    for the birdies, none of whom deigned to show up for this shoot.



  30. Suet cage

    Snapshot Title: Suet cage
    Taken by: Callan Bentley

    Image: Snowy front yard, early Christmas morning 2012
    Image Owner: Callan Bentley



    Description:

    for the birdies, none of whom deigned to show up for this shoot.



  31. Anticline

    Snapshot Title: Anticline
    Taken by: Callan Bentley

    Image: Anticline in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    Note also the well-developed cleavage in the clay-rich beds.



  32. Pencil for scale

    Snapshot Title: Pencil for scale
    Taken by: Callan Bentley

    Image: Anticline in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    Black bars are each 1cm in length.



  33. Even the trees appear folded!

    Snapshot Title: Even the trees appear folded!
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    Heh heh.



  34. Orange flag

    Snapshot Title: Orange flag
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    .



  35. Syncline

    Snapshot Title: Syncline
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    with kind of a flat bottom.



  36. Anticline with strongly-cleaved beds.

    Snapshot Title: Anticline with strongly-cleaved beds.
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    .



  37. Anticline

    Snapshot Title: Anticline
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    Also note the axial plane cleavage.



  38. Pencil for scale

    Snapshot Title: Pencil for scale
    Taken by: Callan Bentley

    Image: Folds in Edinburg Formation, Opequon Creek, Clarke County, Virginia
    Image Owner: Callan Bentley



    Description:

    black bars measure 1 cm each



  39. Leucosome

    Snapshot Title: Leucosome
    Taken by: Callan Bentley

    Image: Migmatite on the Billy Goat Trail
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Little blobs of granite that "sweated out" of the metagraywacke source rock.



  40. Joints parallel to dikes

    Snapshot Title: Joints parallel to dikes
    Taken by: Callan Bentley

    Image: Lamprophyre Dikes on the Virginia Side, Visible From the Billy Goat Trail
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Clearly, the crust here had cooled off significantly between 460 Ma (during the Taconian Orogeny, when the metagraywacke of the Mather Gorge Formation was folded, boudinaged, and partially melted) and...



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