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Callan Bentley's Snapshots

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  1. 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.



  2. 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



  3. 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.



  4. 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



  5. 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.



  6. 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.



  7. 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.



  8. 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



  9. 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.



  10. "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.



  11. 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



  12. 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)



  13. 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.



  14. 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:

    .



  15. 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



  16. 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)



  17. 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.



  18. 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?



  19. 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...



  20. 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!)



  21. Biotite schist

    Snapshot Title: Biotite schist
    Taken by: Callan Bentley

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



    Description:

    In this area...



  22. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

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



    Description:

    Schist/gneiss meets granite.



  23. Joint "T" intersection

    Snapshot Title: Joint "T" intersection
    Taken by: Callan Bentley

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



    Description:

    Which joint came first, based on this relationship?



  24. Lens cap

    Snapshot Title: Lens cap
    Taken by: Callan Bentley

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



    Description:

    (to provide a sense of scale)



  25. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

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



    Description:

    Schist/gneiss meets granite.



  26. Lens cap

    Snapshot Title: Lens cap
    Taken by: Callan Bentley

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



    Description:

    (to provide a sense of scale)



  27. Snails

    Snapshot Title: Snails
    Taken by: Callan Bentley

    Image: Coastal ecology, West Boothbay Harbor, Maine
    Image Owner: Callan Bentley



    Description:

    Hunkering down until high tide comes back.



  28. Kelp float

    Snapshot Title: Kelp float
    Taken by: Callan Bentley

    Image: Coastal ecology, West Boothbay Harbor, Maine
    Image Owner: Callan Bentley



    Description:

    Seaweed.



  29. Geology

    Snapshot Title: Geology
    Taken by: Callan Bentley

    Image: West Boothbay Harbor, Maine
    Image Owner: Callan Bentley



    Description:

    Schist with intercalated granite pegmatite sills, folded and dismembered (boudinaged) during Devonian mountain-building.



  30. Tide?

    Snapshot Title: Tide?
    Taken by: Callan Bentley

    Image: West Boothbay Harbor, Maine
    Image Owner: Callan Bentley



    Description:

    What can you infer about the tide from what you observe in this snapshot? (high? low? ebbing? rising?)



  31. Osprey in nest

    Snapshot Title: Osprey in nest
    Taken by: Callan Bentley

    Image: West Boothbay Harbor, Maine
    Image Owner: Callan Bentley



    Description:

    Osprey incubating eggs.



  32. Fold hinge

    Snapshot Title: Fold hinge
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    Dismembered due to boudinage



  33. better boudinage

    Snapshot Title: better boudinage
    Taken by: Callan Bentley

    Image: Geology of Pemaquid Point, Maine (east)
    Image Owner: eos101



    Description:

    To have a closer look at the boudinage here, check out this GigaPan: www.gigapan.com/gigapans/157549



  34. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    This red pen serves as a sense of scale.



  35. Another view

    Snapshot Title: Another view
    Taken by: Callan Bentley

    Image: Geology of Pemaquid Point, Maine (west)
    Image Owner: eos101



    Description:

    To see a GigaPan from this point, looking toward the lighthouse: www.gigapan.com/gigapans/157527



  36. Boudin

    Snapshot Title: Boudin
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    A boudin from a stretched granite dike.



  37. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    This red ballpoint pen serves as a sense of scale.



  38. Graded bed

    Snapshot Title: Graded bed
    Taken by: Callan Bentley

    Image: Graded Slate & Graywacke Beds
    Image Owner: Brian Allison



    Description:

    Awesome outcrop; thanks for GigaPanning it!



  39. Contact between beds

    Snapshot Title: Contact between beds
    Taken by: Callan Bentley

    Image: Graded Bedding in the Martinsburg Formation
    Image Owner: Robin Rohrback



    Description:

    The fine grained dark gray material below is the top of one graded bed. The sudden, crisp transition to coarse, light-colored sand marks the bottom of the overlying graded bed.



  40. Flame structures

    Snapshot Title: Flame structures
    Taken by: Callan Bentley

    Image: Graded Bedding in the Martinsburg Formation
    Image Owner: Robin Rohrback



    Description:

    Loading structures



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