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Callan Bentley's Snapshots

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  1. 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.



  2. 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.



  3. 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.



  4. Texture

    Snapshot Title: Texture
    Taken by: Callan Bentley

    Image: BGT amphibolite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    .



  5. 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.



  6. 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.



  7. 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.



  8. 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.



  9. 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.



  10. 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:

    .



  11. 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.



  12. 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:

    .



  13. 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.



  14. 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



  15. 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.



  16. 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...



  17. Blocky weathering

    Snapshot Title: Blocky weathering
    Taken by: Callan Bentley

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



    Description:

    A different weathering pattern (and more rapid weathering, resulting in a recessed outcrop expression) typifies the lamprophyre which cuts across metagraywacke of the Mather Gorge Formation at this lo...



  18. Dark miniature

    Snapshot Title: Dark miniature
    Taken by: Callan Bentley

    Image: Lady Cave Anticline
    Image Owner: Ian Stimpson



    Description:

    Same shape, but looks like shale in the interior of this structure.



  19. Joint parallel to dikes

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

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



    Description:

    The crust here behaved in a brittle fashion by 360 Ma.



  20. Lamprophyre

    Snapshot Title: Lamprophyre
    Taken by: Callan Bentley

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



    Description:

    Fresh surface



  21. Eugene the yeastly beastie

    Snapshot Title: Eugene the yeastly beastie
    Taken by: Callan Bentley

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



    Description:

    .



  22. Sacrilege

    Snapshot Title: Sacrilege
    Taken by: Callan Bentley

    Image: Devil's Racecourse
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Nasty habit.



  23. Eugene the Yeastie!

    Snapshot Title: Eugene the Yeastie!
    Taken by: Callan Bentley

    Image: Devil's Racecourse
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Chilling out with similiarly-colored, similarly-shaped, dissimilarly-sized bretheren.



  24. Measure apparent dip

    Snapshot Title: Measure apparent dip
    Taken by: Callan Bentley

    Image: Massanutten Sandstone exposed at Red Hole on Passage Creek
    Image Owner: Callan Bentley



    Description:

    Just put your protractor on the computer screen!



  25. "Red Hole"

    Snapshot Title: "Red Hole"
    Taken by: Callan Bentley

    Image: Massanutten Sandstone exposed at Red Hole on Passage Creek
    Image Owner: Callan Bentley



    Description:

    grafitto



  26. Red, white, and blue

    Snapshot Title: Red, white, and blue
    Taken by: Callan Bentley

    Image: Martinsburg Formation at Guard Hill, north of Front Royal, Virginia
    Image Owner: Callan Bentley



    Description:

    American flag atop the hill. There was a Romney/Ryan sign here ten days earlier.



  27. Ack.

    Snapshot Title: Ack.
    Taken by: Callan Bentley

    Image: Martinsburg Formation at Guard Hill, north of Front Royal, Virginia
    Image Owner: Callan Bentley



    Description:

    Distracted by feeding my infant son whilst GigaPanning, I failed to catch this one...



  28. Bedding

    Snapshot Title: Bedding
    Taken by: Callan Bentley

    Image: Martinsburg Formation at Guard Hill, north of Front Royal, Virginia
    Image Owner: Callan Bentley



    Description:

    in Ordovician flysch - turbidites shed off the Taconian Orogen to the east.



  29. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Massanutten Sandstone exposed on Fort Valley Road
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with cm-scale demarcations.



  30. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Martinsburg Formation at Guard Hill, north of Front Royal, Virginia
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with cm demarcations.



  31. Folds?

    Snapshot Title: Folds?
    Taken by: Callan Bentley

    Image: profil
    Image Owner: Blaž Vičič



    Description:

    Are these fold hinges?



  32. Amphibole

    Snapshot Title: Amphibole
    Taken by: Callan Bentley

    Image: Amphibolite from Great Falls, MD
    Image Owner: Robin Rohrback-Schiavone



    Description:

    The mineral that's the namesake of the rock.



  33. Garnets

    Snapshot Title: Garnets
    Taken by: Callan Bentley

    Image: Another Column at YMCA Camp Harrison, North Carolina
    Image Owner: Callan Bentley



    Description:

    This rock has been metamorphosed!



  34. Stephen

    Snapshot Title: Stephen
    Taken by: Callan Bentley

    Image: Lunch on day 2 of the Inner Piedmont trip
    Image Owner: Callan Bentley



    Description:

    looking skeptically at Dwight?



  35. Dwight

    Snapshot Title: Dwight
    Taken by: Callan Bentley

    Image: Lunch on day 2 of the Inner Piedmont trip
    Image Owner: Callan Bentley



    Description:

    animatedly discussing structural geology, no doubt.



  36. Grand poobah of southern Appalachian structure

    Snapshot Title: Grand poobah of southern Appalachian structure
    Taken by: Callan Bentley

    Image: Lunch on day 2 of the Inner Piedmont trip
    Image Owner: Callan Bentley



    Description:

    Bob Hatcher, University of Tennessee



  37. The boss

    Snapshot Title: The boss
    Taken by: Callan Bentley

    Image: Lunch on day 2 of the Inner Piedmont trip
    Image Owner: Callan Bentley



    Description:

    Arthur Merschat, USGS. Our field trip leader.



  38. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Another Column at YMCA Camp Harrison, North Carolina
    Image Owner: Callan Bentley



    Description:

    Pencil!



  39. Mylonitic flow

    Snapshot Title: Mylonitic flow
    Taken by: Callan Bentley

    Image: Another Column at YMCA Camp Harrison, North Carolina
    Image Owner: Callan Bentley



    Description:

    Check out how the foliation wraps around these two augen!



  40. Outflow from the lake

    Snapshot Title: Outflow from the lake
    Taken by: Callan Bentley

    Image: Overlook, YMCA Camp Harrison, North Carolina
    Image Owner: Callan Bentley



    Description:

    .



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