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Callan Bentley's Snapshots

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  1. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Archean gneiss, Gallatin Range, Montana
    Image Owner: Callan Bentley



    Description:

    This bar is 1 cm long.



  2. Intraclast vein

    Snapshot Title: Intraclast vein
    Taken by: Callan Bentley

    Image: Thin Section of Deformed Quartzite with Small Pebbles
    Image Owner: Paul Karabinos



    Description:

    A thin vein of quartz (parallel to tiny fracture set cutting across this clast's parent lithology). A nice little example of relative dating.



  3. Scratch

    Snapshot Title: Scratch
    Taken by: Callan Bentley

    Image: Gypsum vs. talc
    Image Owner: Callan Bentley



    Description:

    Like the other specimen shown here, this one can be scratched with a fingernail.



  4. Scratch

    Snapshot Title: Scratch
    Taken by: Callan Bentley

    Image: Gypsum vs. talc
    Image Owner: Callan Bentley



    Description:

    This one is really easy to scratch.



  5. Two cleavage planes

    Snapshot Title: Two cleavage planes
    Taken by: Callan Bentley

    Image: Gypsum vs. talc
    Image Owner: Callan Bentley



    Description:

    ...can be seen intersecting here.



  6. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Gypsum vs. talc
    Image Owner: Callan Bentley



    Description:

    1 cm



  7. Border Patrol

    Snapshot Title: Border Patrol
    Taken by: Callan Bentley

    Image: Cristo Rey Mountain
    Image Owner: Joshua Villalobos



    Description:

    Common sight at Cristo Rey.



  8. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Another cross-sectional view.



  9. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    A nice tube-top showing how the formerly-mucus-lined burrow edge is weathering away faster than the surrounding matrix, and faster than the burrow-fill material.



  10. Sand grains

    Snapshot Title: Sand grains
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    I love the fact that you can see individual grains of sand here!



  11. Cochoidal fractures

    Snapshot Title: Cochoidal fractures
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Breaking little quartz sand grains.



  12. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Viewed end-on (map view).



  13. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Viewed in cross-section. Originally, this would have been vertically oriented.



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Skolithos
    Image Owner: Robin Rohrback-Schiavone



    Description:

    1 cm.



  15. The trail

    Snapshot Title: The trail
    Taken by: Callan Bentley

    Image: Looking south from Waterton
    Image Owner: Callan Bentley



    Description:

    Up to Carthew Pass/ Alderson Summit.



  16. Summit Lake

    Snapshot Title: Summit Lake
    Taken by: Callan Bentley

    Image: Looking south from Waterton
    Image Owner: Callan Bentley



    Description:

    Not especially well named, considering we're looking down on it.



  17. Link to a close-up shot

    Snapshot Title: Link to a close-up shot
    Taken by: Callan Bentley

    Image: Miette Group Graded Bedding
    Image Owner: Aaron M Barth



    Description:

    Here's a great example of a graded bed from this outcrop: blogs.agu.org/mountainbeltway/files/2014/08/IMG_3101.jpg Will open in a new tab or window



  18. Structural data

    Snapshot Title: Structural data
    Taken by: Callan Bentley

    Image: Miette Group slate, Trans-Canada Highway and Icefields Parkway junction, Banff National Park
    Image Owner: Callan Bentley



    Description:

    Bedding and cleavage are parallel at this part of the outcrop: Both are oriented 125°/57° (right-hand rule).



  19. Pothole

    Snapshot Title: Pothole
    Taken by: Callan Bentley

    Image: Natural Bridge, Canada 2
    Image Owner: Aaron M Barth



    Description:

    Signature of erosion by sustained currents (vortices)



  20. Cleavage

    Snapshot Title: Cleavage
    Taken by: Callan Bentley

    Image: Natural Bridge, Canada 2
    Image Owner: Aaron M Barth



    Description:

    Spaced cleavage planes crop out nicely here.



  21. Bedding traces

    Snapshot Title: Bedding traces
    Taken by: Callan Bentley

    Image: Natural Bridge, Canada 2
    Image Owner: Aaron M Barth



    Description:

    As viewed on the cleavage plane.



  22. Half of a dog

    Snapshot Title: Half of a dog
    Taken by: Callan Bentley

    Image: Natural Bridge, Canada 2
    Image Owner: Aaron M Barth



    Description:

    Half a man's best friend.



  23. Bioturbation

    Snapshot Title: Bioturbation
    Taken by: Callan Bentley

    Image: Striations in Eldon Formation, exposed near Athabasca Glacier.
    Image Owner: Callan Bentley



    Description:

    Mottled bedding planes where critters plowed through them.



  24. Tension gashes

    Snapshot Title: Tension gashes
    Taken by: Callan Bentley

    Image: Striations in Eldon Formation, exposed near Athabasca Glacier.
    Image Owner: Callan Bentley



    Description:

    Orange veins of calcite.



  25. Striation

    Snapshot Title: Striation
    Taken by: Callan Bentley

    Image: Striations in Eldon Formation, exposed near Athabasca Glacier.
    Image Owner: Callan Bentley



    Description:

    with small-scale "chatter" marks.



  26. Loony

    Snapshot Title: Loony
    Taken by: Callan Bentley

    Image: Striations in Eldon Formation, exposed near Athabasca Glacier.
    Image Owner: Callan Bentley



    Description:

    The Canadian one-dollar coin serves as a sense of scale.



  27. Striations

    Snapshot Title: Striations
    Taken by: Callan Bentley

    Image: Pressure solution in Eldon Formation limestone exposed on roche moutonee east of Athabasca Glacier, Jasper National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    The glacier was here, not too long ago (within the past century).



  28. Pressure solution

    Snapshot Title: Pressure solution
    Taken by: Callan Bentley

    Image: Pressure solution in Eldon Formation limestone exposed on roche moutonee east of Athabasca Glacier, Jasper National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Volume loss due to pressure solution is a better explanation for these offset marker veins. Note the difference in the distance between the two sub-veins on either side of the "fault" (really, a press...



  29. Wait a second...

    Snapshot Title: Wait a second...
    Taken by: Callan Bentley

    Image: Pressure solution in Eldon Formation limestone exposed on roche moutonee east of Athabasca Glacier, Jasper National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    ...If these are faults, then why isn't the sense of offset consistent?



  30. Loony

    Snapshot Title: Loony
    Taken by: Callan Bentley

    Image: Pressure solution in Eldon Formation limestone exposed on roche moutonee east of Athabasca Glacier, Jasper National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    The Canadian one-dollar coin serves as a sense of scale.



  31. Two buried soil horizons

    Snapshot Title: Two buried soil horizons
    Taken by: Callan Bentley

    Image: Alluvium and soil profiles
    Image Owner: Callan Bentley



    Description:

    And the implication of two overtopping floods that smothered the soil in gravel.



  32. Fast currents...

    Snapshot Title: Fast currents...
    Taken by: Callan Bentley

    Image: Alluvium and soil profiles
    Image Owner: Callan Bentley



    Description:

    ...move big cobbles.



  33. Fireweed

    Snapshot Title: Fireweed
    Taken by: Callan Bentley

    Image: Alluvium and soil profiles
    Image Owner: Callan Bentley



    Description:

    A classic wildflower of the Canadian Rockies and points north.



  34. Soil horizons

    Snapshot Title: Soil horizons
    Taken by: Callan Bentley

    Image: Alluvium and soil profiles
    Image Owner: Callan Bentley



    Description:

    ...are dark and fine-grained compared to the alluvial gravel they grow on top of.



  35. Site of sedimentary deposition #3

    Snapshot Title: Site of sedimentary deposition #3
    Taken by: Callan Bentley

    Image: Stutfield Glacier, Jasper National Park, Alberta, Canada
    Image Owner: Callan Bentley



    Description:

    End moraine (glacial till)



  36. Sediment deposition #2

    Snapshot Title: Sediment deposition #2
    Taken by: Callan Bentley

    Image: Stutfield Glacier, Jasper National Park, Alberta, Canada
    Image Owner: Callan Bentley



    Description:

    Colluvium cone (rockfall) / talus "slope"



  37. Sediment deposition site #1

    Snapshot Title: Sediment deposition site #1
    Taken by: Callan Bentley

    Image: Stutfield Glacier, Jasper National Park, Alberta, Canada
    Image Owner: Callan Bentley



    Description:

    Outwash gravels in braided stream.



  38. Another outsized clast

    Snapshot Title: Another outsized clast
    Taken by: Callan Bentley

    Image: Miette gritstone with outsized clast, southern Icefields Parkway, Banff National Park
    Image Owner: Callan Bentley



    Description:

    This one of flaky greenish argillite/slate



  39. Quartz vein

    Snapshot Title: Quartz vein
    Taken by: Callan Bentley

    Image: Miette gritstone with outsized clast, southern Icefields Parkway, Banff National Park
    Image Owner: Callan Bentley



    Description:

    A little structural geology to complicate the picture a bit.



  40. Missing clast

    Snapshot Title: Missing clast
    Taken by: Callan Bentley

    Image: Miette gritstone with outsized clast, southern Icefields Parkway, Banff National Park
    Image Owner: Callan Bentley



    Description:

    Another clast has weathered out from here, it would appear.



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