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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: Kaap Valley Pluton, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm long.



  2. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Mafic enclaves in the Kaap Valley Pluton, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm in length.



  3. Don & Gary

    Snapshot Title: Don & Gary
    Taken by: Callan Bentley

    Image: View east over paleotopographic relief at the base of the Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    Don Lowe (Stanford) and Gary Byerly (Louisiana State University), two of the most experienced Barberton geologists in the world.



  4. Geologists for scale

    Snapshot Title: Geologists for scale
    Taken by: Callan Bentley

    Image: View over outcrops of the Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    Talking over lunch



  5. Geologists for scale

    Snapshot Title: Geologists for scale
    Taken by: Callan Bentley

    Image: View over outcrops of the Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    Having lunch!



  6. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    This yellow bar is 1 cm long (tall).



  7. Buck Reef Chert

    Snapshot Title: Buck Reef Chert
    Taken by: Callan Bentley

    Image: View over paleotopography below the Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    See a block of this beautiful rock here: gigapan.com/gigapans/190694



  8. Geologist for scale

    Snapshot Title: Geologist for scale
    Taken by: Callan Bentley

    Image: View over paleotopography below the Buck Reef Chert
    Image Owner: Callan Bentley



    Description:

    Taking a break...



  9. 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.



  10. 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



  11. Fresh pyrite

    Snapshot Title: Fresh pyrite
    Taken by: Callan Bentley

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



    Description:

    Golden luster



  12. Weathered pyrite

    Snapshot Title: Weathered pyrite
    Taken by: Callan Bentley

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



    Description:

    Brown patina



  13. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

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



    Description:

    1 cm



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

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



    Description:

    This is 1 cm long.



  15. 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.



  16. Isoclinal fold

    Snapshot Title: Isoclinal fold
    Taken by: Callan Bentley

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



    Description:

    in mylonitic foliation



  17. Tight fold

    Snapshot Title: Tight fold
    Taken by: Callan Bentley

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



    Description:

    in mylonitic foliation



  18. 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



  19. 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).



  20. 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



  21. 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



  22. 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



  23. Zoning

    Snapshot Title: Zoning
    Taken by: Callan Bentley

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



    Description:

    = changes in magma composition



  24. 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.



  25. 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.



  26. 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.



  27. 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").



  28. 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").



  29. 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.



  30. 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.



  31. 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.



  32. 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.



  33. 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.



  34. 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.



  35. 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.



  36. 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.



  37. 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).



  38. 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)



  39. 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.



  40. 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



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