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Callan Bentley's Snapshots

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  1. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Graptolites, Dob's Linn, Scotland
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm wide.



  2. Pyrite has no cleavage

    Snapshot Title: Pyrite has no cleavage
    Taken by: Callan Bentley

    Image: Pyrite-bearing phyllite, Islay, Scotland
    Image Owner: Callan Bentley



    Description:

    as this porphyroblast shows



  3. Fresh pyrite

    Snapshot Title: Fresh pyrite
    Taken by: Callan Bentley

    Image: Pyrite-bearing phyllite, Islay, Scotland
    Image Owner: Callan Bentley



    Description:

    Golden luster



  4. Weathered pyrite

    Snapshot Title: Weathered pyrite
    Taken by: Callan Bentley

    Image: Pyrite-bearing phyllite, Islay, Scotland
    Image Owner: Callan Bentley



    Description:

    Brown patina



  5. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Pyrite-bearing phyllite, Islay, Scotland
    Image Owner: Callan Bentley



    Description:

    1 cm



  6. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Gabbro, Fetlar, Shetland
    Image Owner: Callan Bentley



    Description:

    This is 1 cm long.



  7. Lichen

    Snapshot Title: Lichen
    Taken by: Callan Bentley

    Image: Mylonite, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    little black button style lichen growing on the sample.



  8. Isoclinal fold

    Snapshot Title: Isoclinal fold
    Taken by: Callan Bentley

    Image: Mylonite, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    in mylonitic foliation



  9. Tight fold

    Snapshot Title: Tight fold
    Taken by: Callan Bentley

    Image: Mylonite, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    in mylonitic foliation



  10. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Mylonite, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    1 cm



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Stac Fada member of the Clachtoll Formation
    Image Owner: Callan Bentley



    Description:

    This circle (ellipse) is 5 mm in diameter (width).



  12. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: Drumadoon Sill
    Image Owner: Callan Bentley



    Description:

    Here's a GIGAmacro of a sample of rock from near this site: gigapan.com/gigapans/189927



  13. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Examine a piece of this porphyry here: gigapan.com/gigapans/189927



  14. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: Contact between two dikes, Blackwaterfoot, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Examine a sample of this porphyry here: gigapan.com/gigapans/189927



  15. Zoning

    Snapshot Title: Zoning
    Taken by: Callan Bentley

    Image: Porphyritic dike rock, Blackwaterfoot, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    = changes in magma composition



  16. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic dike rock, Blackwaterfoot, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    This is 1 cm long.



  17. Dike interior

    Snapshot Title: Dike interior
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Coarse grained porphyry.



  18. Chilled margin

    Snapshot Title: Chilled margin
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Fine-grained, yellowish edge of dike.



  19. Contact metamorphism

    Snapshot Title: Contact metamorphism
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Baked "hornfels" of the Auchenhew Mudstone Formation ("New Red Sandstone").



  20. Sedimentary rock

    Snapshot Title: Sedimentary rock
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Unmetamorphosed Triassic-aged host rocks of the Auchenhew Mudstone Formation ("New Red Sandstone").



  21. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: "Chill and bake," Blackwaterfoot Beach, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil w/ black bars each 1 cm in length running down the side.



  22. Primary sedimentary structure

    Snapshot Title: Primary sedimentary structure
    Taken by: Callan Bentley

    Image: Triassic red beds, near Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Identify the feature here. Interpret it.



  23. Primary sedimentary structure

    Snapshot Title: Primary sedimentary structure
    Taken by: Callan Bentley

    Image: Triassic red beds, near Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Identify the feature here. Interpret it.



  24. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Triassic red beds, near Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil with 1-centimeter length black bars along the side.



  25. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Dike contact exposed at Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Poorly stitched, but this is a mechanical pencil w/ 1-cm black bars along the side.



  26. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Dike contact exposed at Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Poorly stitched, but this is a mechanical pencil w/ 1-cm black bars along the side.



  27. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Dike contact exposed at Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    (Poorly stitched) Mechanical pencil w/ one-centimeter markings running down the side.



  28. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Dike contact exposed at Kildonan, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil w/ one-centimeter markings running down the side.



  29. Dalradian chips

    Snapshot Title: Dalradian chips
    Taken by: Callan Bentley

    Image: Permian sedimentary rocks near the site of Hutton's Unconformity, Lochranza, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    These green bits are some of the locally-derived meta-turbidites beneath the unconformity surface (i.e., Dalradian).



  30. What can this tell you?

    Snapshot Title: What can this tell you?
    Taken by: Callan Bentley

    Image: Permian sedimentary rocks near the site of Hutton's Unconformity, Lochranza, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    (About the conditions under which these strata were deposited)



  31. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Permian sedimentary rocks near the site of Hutton's Unconformity, Lochranza, Arran, Scotland
    Image Owner: Callan Bentley



    Description:

    Mechanical pencil w/ 1 cm black bars along the side.



  32. Sand

    Snapshot Title: Sand
    Taken by: Callan Bentley

    Image: Stoer group unconformity (over Lewisian gneiss), Clachtoll, Scotland.
    Image Owner: Callan Bentley



    Description:

    Examine a sample of sand from this site here: gigapan.com/gigapans/189854



  33. Fly

    Snapshot Title: Fly
    Taken by: Callan Bentley

    Image: Salterella Grit, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    That's no fossil!



  34. Current indictor

    Snapshot Title: Current indictor
    Taken by: Callan Bentley

    Image: Diabeg Formation, Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    What primary sedimentary structure can be observed here?



  35. Current indicator

    Snapshot Title: Current indicator
    Taken by: Callan Bentley

    Image: Diabeg Formation, Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    What primary sedimentary structure can be observed here?



  36. Current strength

    Snapshot Title: Current strength
    Taken by: Callan Bentley

    Image: Diabeg Formation, Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    How does the current strength recorded change within this snapshot?



  37. Driekanter pebble

    Snapshot Title: Driekanter pebble
    Taken by: Callan Bentley

    Image: Diabeg Formation, Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    "Shaped like a Brazil nut"



  38. Lots of feldspar

    Snapshot Title: Lots of feldspar
    Taken by: Callan Bentley

    Image: Diabeg Formation, Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    Arkosic.



  39. Contact

    Snapshot Title: Contact
    Taken by: Callan Bentley

    Image: Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    What is the nature of this contact?



  40. Gnessic banding

    Snapshot Title: Gnessic banding
    Taken by: Callan Bentley

    Image: Torridonian Group, North-West Highlands, Scotland
    Image Owner: Callan Bentley



    Description:

    Archean Lewisian gneiss at the bottom of this outcrop, with foliation apparently dipping ~45 degrees to the left (west).



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