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Callan Bentley's Snapshots

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  1. Loony

    Snapshot Title: Loony
    Taken by: Callan Bentley

    Image: Bow Falls Tool Marks
    Image Owner: Aaron M Barth



    Description:

    The Canadian one-dollar coin is included to provide a sense of scale.



  2. Stromatolites

    Snapshot Title: Stromatolites
    Taken by: Callan Bentley

    Image: Cirque Peak, Banff National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Cambrian microbial mounds, fossilized.



  3. Orthogonal joint set

    Snapshot Title: Orthogonal joint set
    Taken by: Callan Bentley

    Image: Cirque Peak, Banff National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Making a cross-hatched pattern in the limestone.



  4. Hiker

    Snapshot Title: Hiker
    Taken by: Callan Bentley

    Image: Cirque Peak, Banff National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Descending from the summit.



  5. Sweet folds

    Snapshot Title: Sweet folds
    Taken by: Callan Bentley

    Image: Cirque Peak, Banff National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Great folds on the southeast side of the mountain. Arctomys Formation.



  6. Stromatoporoid vug

    Snapshot Title: Stromatoporoid vug
    Taken by: Callan Bentley

    Image: Cairn Formation, Bow River Parkway, Alberta
    Image Owner: Callan Bentley



    Description:

    Stromatoporoid fossils (primitive, layered sponges) have been etched out to make hollows ("vugs") that can hold petroleum in the subsurface. This rock is drilled in the Edmonton area as a major reserv...



  7. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Cairn Formation, Bow River Parkway, Alberta
    Image Owner: Callan Bentley



    Description:

    This pen serves as a sense of scale.



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Pekisko Formation, Lac des Arcs, Alberta
    Image Owner: Callan Bentley



    Description:

    This pen serves as a sense of scale.



  9. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Viewed from the top (plan view).



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm long.



  11. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Top view? Bottom view? Side view? Which way is up?



  12. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Is this a vertical cross-section or a plan view?



  13. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    This black bar is one centimeter long.



  14. stromatolite showing growth laminations

    Snapshot Title: stromatolite showing growth laminations
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    which way is up?



  15. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm long.



  16. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    Which way is up?



  17. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Stromatolites, Helena Formation, near Crypt Lake, Waterton Lakes National Park, Alberta
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm long.



  18. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    Between granite pegmatite and metamorphic host rocks.



  19. My dad's hand

    Snapshot Title: My dad's hand
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    Wow - I didn't notice he was in the GigaPan!



  20. bench

    Snapshot Title: bench
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    a good place for a weary geologist to rest



  21. Slickensides

    Snapshot Title: Slickensides
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    These slickensides reinforce the interpretation that this is a fault breccia rather than a sedimentary breccia.



  22. Cross-sectional view

    Snapshot Title: Cross-sectional view
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    Rotate the sample 90 degrees and take a look at the side-view, here:
    www.gigapan.com/gigapans/157860



  23. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    This bar is 1 cm long.



  24. Bottom view

    Snapshot Title: Bottom view
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    Rotate the sample 90 degrees, and take a look at the slickensides along the bottom: gigapan.com/gigapans/156561



  25. Vein calcite

    Snapshot Title: Vein calcite
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    Vein calcite that presumably sealed the fault prior to reactivation and disaggregation, and ultimately being entombed in the new breccia.



  26. Limestone clast

    Snapshot Title: Limestone clast
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    A fragment of the fault's wall rock, tumbled in the fault zone.



  27. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Fault Breccia in the Helderberg Group
    Image Owner: Robin Rohrback



    Description:

    This box is 1 centimeter long.



  28. Fold hinge

    Snapshot Title: Fold hinge
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Fold hinge



  29. Cuspate / lobate boundaries

    Snapshot Title: Cuspate / lobate boundaries
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    felsic layers have bulbous boundaries, while the mafic layers squirt out of the way.



  30. "W"

    Snapshot Title: "W"
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Small scale fold.



  31. Garnets

    Snapshot Title: Garnets
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Nice round porphyroblasts



  32. Red pen

    Snapshot Title: Red pen
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    (to serve as a sense of scale)



  33. Tafoni

    Snapshot Title: Tafoni
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Some weathering pits evident in these seaside exposures.



  34. Ptygmatic folding

    Snapshot Title: Ptygmatic folding
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    .



  35. Differential weathering

    Snapshot Title: Differential weathering
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    of folded layers with different compositions



  36. Red pen

    Snapshot Title: Red pen
    Taken by: Callan Bentley

    Image: Folded metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    (for a sense of scale)



  37. Boudin train

    Snapshot Title: Boudin train
    Taken by: Callan Bentley

    Image: Metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    A nice series of diminishingly-sized boudins.



  38. Fold hinge?

    Snapshot Title: Fold hinge?
    Taken by: Callan Bentley

    Image: Metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Is this a dismembered fold hinge?



  39. Boudinage

    Snapshot Title: Boudinage
    Taken by: Callan Bentley

    Image: Metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    Stretching in the brittle/ductile realm causes some geologic units (like this granite dike) to break into segments called boudins, while other units (such as the surrounding schist) flow into the "nec...



  40. Red pen

    Snapshot Title: Red pen
    Taken by: Callan Bentley

    Image: Metamorphic rocks exposed along the shore of Cabbage Island, Maine
    Image Owner: Callan Bentley



    Description:

    This pen serves as a sense of scale (and also distortion!)



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