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Callan Bentley's Snapshots

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  1. Cross cutting relationships

    Snapshot Title: Cross cutting relationships
    Taken by: Callan Bentley

    Image: Felsite intrusion, Iceland
    Image Owner: Callan Bentley



    Description:

    The felsic rock must be younger than the more mafic rock it cuts across.



  2. Lens cap

    Snapshot Title: Lens cap
    Taken by: Callan Bentley

    Image: Felsite intrusion, Iceland
    Image Owner: Callan Bentley



    Description:

    To serve as a sense of scale.



  3. Dark layers

    Snapshot Title: Dark layers
    Taken by: Callan Bentley

    Image: Microbially-induced sedimentary structures, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    are microbial mat fossils



  4. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Microbially-induced sedimentary structures, Barberton Greenstone Belt, South Africa
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm wide.



  5. Hinges

    Snapshot Title: Hinges
    Taken by: Callan Bentley

    Image: Igneous Intrusions in Gneiss, Clear Creek Canyon, Colorado
    Image Owner: Robin Rohrback



    Description:

    A bunch of fold hinges, disharmonically all piled up.



  6. Leucosome cross-cutting foliation

    Snapshot Title: Leucosome cross-cutting foliation
    Taken by: Callan Bentley

    Image: Igneous Intrusions in Gneiss, Clear Creek Canyon, Colorado
    Image Owner: Robin Rohrback



    Description:

    Evidence of migmatization?



  7. Stratigraphy of spherule

    Snapshot Title: Stratigraphy of spherule
    Taken by: Callan Bentley

    Image: Spherulitic felsite, Shetland
    Image Owner: Callan Bentley



    Description:

    Multilayer gobstopper



  8. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Spherulitic felsite, Shetland
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm tall.



  9. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Green Tuff from Jawbone Flats, Oregon
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm tall.



  10. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: Spherulitic felsite, Shetland
    Image Owner: Callan Bentley



    Description:

    with radiating structure.



  11. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Spherulitic felsite, Shetland
    Image Owner: Callan Bentley



    Description:

    1 cm width



  12. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    Along boundary between other two minerals.



  13. Augite

    Snapshot Title: Augite
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    pyroxene



  14. Plagioclase

    Snapshot Title: Plagioclase
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    feldspar



  15. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Garent-bearing anorthosite
    Image Owner: Callan Bentley



    Description:

    1 cm black bar.



  16. Animal analogy?

    Snapshot Title: Animal analogy?
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    Is it more like a hedgehog, an echidna, or a porcupine?



  17. Radial crystals

    Snapshot Title: Radial crystals
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    in a spherulite



  18. Spherule structure

    Snapshot Title: Spherule structure
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    These spherules are primary igneous textural elements in this felsic rock. They consist of radial "hedgehogs" of crystals clustered around a common point of nucleation.



  19. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Felsic spherulite from Shetland
    Image Owner: Callan Bentley



    Description:

    This is 1 cm wide.



  20. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  21. Radial calcite

    Snapshot Title: Radial calcite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    in the rostrum of the belemnite



  22. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil
    Image Owner: Callan Bentley



    Description:

    This is 1 cm wide.



  23. Stylolite

    Snapshot Title: Stylolite
    Taken by: Callan Bentley

    Image: Ulster White Limestone ("The Chalk") with belemnite fossil, Rathlin Island, Northern Ireland (U.K.)
    Image Owner: Callan Bentley



    Description:

    Pressure solution seam



  24. Scale
  25. Belemnite
  26. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Round plate from the exterior of a coccolithophore



  27. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Another armor plate from a coccolithophore



  28. Coccolith

    Snapshot Title: Coccolith
    Taken by: Callan Bentley

    Image: Ulster White Limestone
    Image Owner: Robin Rohrback



    Description:

    Round little doily



  29. Concentric layering

    Snapshot Title: Concentric layering
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapepe Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Pretty clear in this example



  30. Concentric layering

    Snapshot Title: Concentric layering
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapepe Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Seen in some spherules



  31. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapepe Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    In cross section, 3D, and external molds (spherule-shaped hollows where they have popped out)



  32. Mud drape

    Snapshot Title: Mud drape
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapepe Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    between spherulite horizons



  33. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S3 spherulite layer in Mapepe Formation, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    This black bar is 1 cm "tall"



  34. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    in cross-section and 3D



  35. Spherules

    Snapshot Title: Spherules
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Some 3D examples



  36. Mud drape

    Snapshot Title: Mud drape
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Running through the center of the sample. Which way is "up?"



  37. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Clear concentric layering in this one.



  38. Spherule

    Snapshot Title: Spherule
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    Nice round one showing concentric structure.



  39. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: S3 spherulite layer in the Mapepe Formation, Fig Tree Group
    Image Owner: Callan Bentley



    Description:

    This is 1 cm.



  40. Exemplary spherules

    Snapshot Title: Exemplary spherules
    Taken by: Callan Bentley

    Image: S3 spherulite, Fig Tree Group, Barberton Greenstone Belt
    Image Owner: Callan Bentley



    Description:

    Interacting with mud drape



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