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Callan Bentley's Snapshots

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  1. Big tabular clast

    Snapshot Title: Big tabular clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    A big slabby chunk of quartzite included in the metagraywacke/schist matrix.



  2. Hammer for scale

    Snapshot Title: Hammer for scale
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Here is the butt end of the hammer.



  3. Reaction rim

    Snapshot Title: Reaction rim
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Another signal of chemical re-equilibration between clast and matrix.



  4. Mafic clast w/ reaction rim

    Snapshot Title: Mafic clast w/ reaction rim
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Amphibolite?



  5. Milky quartz inclusions

    Snapshot Title: Milky quartz inclusions
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    exposed on the plane of foliation.



  6. Hammer for scale

    Snapshot Title: Hammer for scale
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Top of the handle



  7. Students

    Snapshot Title: Students
    Taken by: Callan Bentley

    Image: Gastropod duplex w/ people for scale
    Image Owner: Callan Bentley



    Description:

    Zack, Matt, and Jake, checking out the structural geology.



  8. Percussion marks

    Snapshot Title: Percussion marks
    Taken by: Callan Bentley

    Image: Second Generation Quartz, Billy Goat Trail
    Image Owner: Marissa Dudek



    Description:

    Great examples.



  9. Percussion marks

    Snapshot Title: Percussion marks
    Taken by: Callan Bentley

    Image: Second Generation Quartz, Billy Goat Trail
    Image Owner: Marissa Dudek



    Description:

    Bouncing cobbles in the ancient Potomac River slammed into this postively-weathering vein to make these features.



  10. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: Faulted- Tonoloway
    Image Owner: Alan Pitts



    Description:

    Details here:
    gigapan.com/gigapans/174628



  11. Slogan

    Snapshot Title: Slogan
    Taken by: Callan Bentley

    Image: Syncline Fold, Corridor H
    Image Owner: Marissa Dudek



    Description:

    Resolution's good enough to read off the fine print on the license plate.



  12. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: Syncline Fold, Corridor H
    Image Owner: Marissa Dudek



    Description:

    A big difference in bedding orientation in upper left of snapshot relative to lower right, and an oxidized zone of rubble in between. Fault!



  13. Beautiful brach

    Snapshot Title: Beautiful brach
    Taken by: Callan Bentley

    Image: Fossils in Reynolds Limestone, Mauch Chunk Formation
    Image Owner: Marissa Dudek



    Description:

    Exterior



  14. Eye

    Snapshot Title: Eye
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    This one has an iris!



  15. Hmmm

    Snapshot Title: Hmmm
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    What's up with these half-spherical concavities?



  16. Microcave

    Snapshot Title: Microcave
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Looks like a good site for a bird nest?



  17. Differential dissolution

    Snapshot Title: Differential dissolution
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Some of these strata are more soluble than others.



  18. Clover

    Snapshot Title: Clover
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    in bloom



  19. Flowers

    Snapshot Title: Flowers
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    A small bouquet



  20. Extensional veins

    Snapshot Title: Extensional veins
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Filled w/ pure white calcite



  21. Intersecting joint sets

    Snapshot Title: Intersecting joint sets
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    A conjugate set?



  22. Dissolution

    Snapshot Title: Dissolution
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    on joint surfaces. Also, oxidation.



  23. Art

    Snapshot Title: Art
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    My two-year-old's depiction of Darth Vader. 2015. Medium: gravel and carpaint.



  24. PATC

    Snapshot Title: PATC
    Taken by: Callan Bentley

    Image: Helderberg Limestone, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Potomac Appalachian Trail Club sticker on the GigaPanMobile.



  25. Breakage

    Snapshot Title: Breakage
    Taken by: Callan Bentley

    Image: Millboro Climbing Ripples
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This sample readily parts along bedding planes, but will also break across bedding planes if it needs to.



  26. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Millboro Climbing Ripples
    Image Owner: Robin Rohrback-Schiavone



    Description:

    1 cm wide



  27. Change in thickness

    Snapshot Title: Change in thickness
    Taken by: Callan Bentley

    Image: Millboro Climbing Ripples
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Watch how the light colored lamination goes from relatively thick (on inclined surface - the slipface of the Devonian ripple) to thin on the downstream gentler slope.



  28. PATC logo

    Snapshot Title: PATC logo
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, showing Reynolds Limestone Member
    Image Owner: Callan Bentley



    Description:

    Potomac Appalachian Trail Club sticker in the window of the GigaPanMobile.



  29. Rockfall

    Snapshot Title: Rockfall
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, showing Reynolds Limestone Member
    Image Owner: Callan Bentley



    Description:

    The biggest pieces go the furthest...



  30. Jeff & Bridget

    Snapshot Title: Jeff & Bridget
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, showing Reynolds Limestone Member
    Image Owner: Callan Bentley



    Description:

    GigaPanners in training examine the base of the Reynolds Limestone.



  31. Root traces

    Snapshot Title: Root traces
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Reduced chemistry cross-cutting surrounding oxidized sediment.



  32. Concentric ribs

    Snapshot Title: Concentric ribs
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Conchoidal fracture.



  33. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Georgetown Intrusive Suite, Rock Creek Park, Washington, DC
    Image Owner: Callan Bentley



    Description:

    1 cm long



  34. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Garnetiferous metagraywacke, Rock Creek Shear Zone, Washington, DC
    Image Owner: Callan Bentley



    Description:

    porphyroblast



  35. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Garnetiferous metagraywacke, Rock Creek Shear Zone, Washington, DC
    Image Owner: Callan Bentley



    Description:

    3 cm



  36. Stretched  clast

    Snapshot Title: Stretched clast
    Taken by: Callan Bentley

    Image: Stretched clasts in Laurel Formtion metagraywacke, Rock Creek Shear Zone, Washington, DC
    Image Owner: Callan Bentley



    Description:

    Axial ratio of 4 to 1?



  37. Stretched quartz clast

    Snapshot Title: Stretched quartz clast
    Taken by: Callan Bentley

    Image: Stretched clasts in Laurel Formtion metagraywacke, Rock Creek Shear Zone, Washington, DC
    Image Owner: Callan Bentley



    Description:

    One of several



  38. Scale
  39. What's this?

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

    Image: Klamath Basin
    Image Owner: Aaron M Barth



    Description:

    A box? A cinder block?



  40. Offset

    Snapshot Title: Offset
    Taken by: Callan Bentley

    Image: Klamath Faults 2
    Image Owner: Aaron M Barth



    Description:

    A thing of beauty!



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