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Callan Bentley's Snapshots

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  1. "tree"

    Snapshot Title: "tree"
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    These trees have a tough time of it every time the river floods.



  2. Silt

    Snapshot Title: Silt
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    These boulders are unavailable for your viewing pleasure, thanks to deposits of river silt.



  3. Differential weathering

    Snapshot Title: Differential weathering
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    The lighter-colored layers (former sand layers from turbidites?) weather out in positive relief because they are harder and more chemically stable than the darker-colored layers (former mud layers fro...



  4. Sweet little fold

    Snapshot Title: Sweet little fold
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Nice little fellah



  5. Interesting texture

    Snapshot Title: Interesting texture
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    I would love for someone to explain this to me -- these dark "spongey" shapes surrounded by halos of lighter colored rock.



  6. Interesting texture

    Snapshot Title: Interesting texture
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    I would love for someone to explain this to me -- these dark "spongey" shapes surrounded by halos of lighter colored rock.



  7. Interesting texture

    Snapshot Title: Interesting texture
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    I would love for someone to explain this to me -- these dark "spongey" shapes surrounded by halos of lighter colored rock.



  8. Nice complicated fold

    Snapshot Title: Nice complicated fold
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Isoclinal folds, partially dismembered by boudinage.



  9. Boudins and blobs

    Snapshot Title: Boudins and blobs
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Complicated textures in these migmatitic (partially melted) rocks.



  10. Pothole

    Snapshot Title: Pothole
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    This area is drilled full of potholes from times when the Potomac River was flowing at a higher level and these rock exposures were the bottom of the river.



  11. Boudinage

    Snapshot Title: Boudinage
    Taken by: Callan Bentley

    Image: Metamorphosed, boudinaged bedding of the Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Boudinage of "bedding" (?) layers in these highly metamorphosed rocks. Note the granite "leucosome" that occupies the boudin necks.



  12. Blinds

    Snapshot Title: Blinds
    Taken by: Callan Bentley

    Image: SIERRA DE GREDOS
    Image Owner: ROMÁN PULIDO



    Description:

    rolled up but not quite all the way



  13. Boulders

    Snapshot Title: Boulders
    Taken by: Callan Bentley

    Image: Perito Moreno
    Image Owner: Kristian Solberg



    Description:

    ...some of rock, some of ice.



  14. Folded boudin

    Snapshot Title: Folded boudin
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    A fold hinge where most of the folded layer has been dismembered and strung out?



  15. Yet another contact

    Snapshot Title: Yet another contact
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    between light colored granite (right) and dark colored, boudin-rich, foliated schist (left)



  16. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Between light-colored, massive granite (left) and pre-existing dark-colored, foliated schist (metasediments) at right.



  17. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Contact between older foliated schist (dark colored, layered rocks above) and granite (light colored, granular, massive rocks below)



  18. Boudinage

    Snapshot Title: Boudinage
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    more stretching and pinching off of stronger rock units (light colored), with weaker (darker) rocks flowing into the "necks in between them.



  19. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Granite (left) meets schist (dark colored and foliated, right)



  20. Granite dikes

    Snapshot Title: Granite dikes
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Several light-colored dikes of granite cut across the dark-colored, foliated metamorphic rocks in this snapshot. Granites in the area have been dated to ~460 million years ago.



  21. Boudin

    Snapshot Title: Boudin
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Chunk of light-colored rock stretched out and broken off, with foliation wrapping around it.



  22. S-fold

    Snapshot Title: S-fold
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    An asymmetric fold with a "right side up" sense of kinematics.



  23. Crinkly folds

    Snapshot Title: Crinkly folds
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    Small scale "crenulation" folds overprint metamorphic foliation.



  24. Folded granite dikes

    Snapshot Title: Folded granite dikes
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed on C&O Canal
    Image Owner: Callan Bentley



    Description:

    This may show two generations of folding: an earlier isoclinal, recumbent generation that has made the arms of the fold parallel with one another, and then that would be overprinted by a second (more ...



  25. Ripple marks?

    Snapshot Title: Ripple marks?
    Taken by: Callan Bentley

    Image: Meteora and the village of Kastraki
    Image Owner: Dimitris Stamoulis



    Description:

    This undulating surface -- is this some sort of bedform in the sedimentary layers? If not ripples, then perhaps "dunes" or antidunes?



  26. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Antiform in Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Granite meets metamorphic rock (~schist)



  27. Two examples of boudinage

    Snapshot Title: Two examples of boudinage
    Taken by: Callan Bentley

    Image: Antiform in Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    ...in the metamorphic host rocks.



  28. itty bitty fold

    Snapshot Title: itty bitty fold
    Taken by: Callan Bentley

    Image: Antiform in Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    This fold is "parasitic" on the larger antiformal structure.



  29. Layered rock meets granite

    Snapshot Title: Layered rock meets granite
    Taken by: Callan Bentley

    Image: Antiform in Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Layered (relict bedding? metamorphic foliation? both?) metamorphic rock [on right] meets an intrusion of pinkish, granular granite [on left].



  30. Hinge of antiform

    Snapshot Title: Hinge of antiform
    Taken by: Callan Bentley

    Image: Antiform in Mather Gorge Formation
    Image Owner: Callan Bentley



    Description:

    Nicely defined and differentially weathered.



  31. Another impression?

    Snapshot Title: Another impression?
    Taken by: Callan Bentley

    Image: Bed T4, Ediacaran, South Australia
    Image Owner: Phoebe Cohen



    Description:

    I'd love to see someone who knows what they're talking about label the different parts of this outcrop.



  32. Ediacaran trace fossil...

    Snapshot Title: Ediacaran trace fossil...
    Taken by: Callan Bentley

    Image: Bed T4, Ediacaran, South Australia
    Image Owner: Phoebe Cohen



    Description:

    What kind?



  33. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Trezona Formation Stromatolites
    Image Owner: Ariel Anbar



    Description:

    Showing both 3D shape and 2D cross-sectional view of concentric layers.



  34. Recumbent fold

    Snapshot Title: Recumbent fold
    Taken by: Callan Bentley

    Image: Cerro Fitz Roy
    Image Owner: Kristian Solberg



    Description:

    Tight fold with shallowly-dipping axial plane.



  35. Isoclinal recumbent fold?

    Snapshot Title: Isoclinal recumbent fold?
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    This might be an isoclinal (limbs almost parallel) recumbent (lying down horizontally) fold. Anyone familiar with the area able to say for sure?



  36. Intriguing cross-cutting relationships here

    Snapshot Title: Intriguing cross-cutting relationships here
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    I'd love to know what these three rocks are and the tectonic context for this clear cross-cutting relationships.



  37. Bergshrund

    Snapshot Title: Bergshrund
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    The big crack at the head of the glacier, where it meets the headwall of the cirque



  38. Laminations in glacial ice

    Snapshot Title: Laminations in glacial ice
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    Dirty layers = summers?



  39. Fold with faults

    Snapshot Title: Fold with faults
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    A nice look at how ~vertical faults have offset the dark layer that is contorted into a recumbent fold (recumbent = axial plane of fold is ~horizontal).



  40. Awesome folds!

    Snapshot Title: Awesome folds!
    Taken by: Callan Bentley

    Image: Umgebung von Zermatt
    Image Owner: M A



    Description:

    Well expressed folds in the differently-colored rock layers.



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