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Callan Bentley's Snapshots

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  1. Aargh

    Snapshot Title: Aargh
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    Truck drove by, and the wind in its wake torqued my scale stick. Got it fixed before the next row, though.



  2. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    10 cm tall black bar



  3. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Edinburg Formation, showing Alleghanian cleavage, near Cedarville, Virginia
    Image Owner: Callan Bentley



    Description:

    1 cm black bar



  4. Reaction rims

    Snapshot Title: Reaction rims
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    Like a little "necklace"



  5. Pyroxene?

    Snapshot Title: Pyroxene?
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    .



  6. Zoned feldspar

    Snapshot Title: Zoned feldspar
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    Zoning reflected as color differences in a single feldspar phenocryst: this reflects a changing magma composition.



  7. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Porphyritic andesite, Crazy Mountains, Montana
    Image Owner: Callan Bentley



    Description:

    This horizontal bar is 1 cm long.



  8. Ostracode shell

    Snapshot Title: Ostracode shell
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    in cross-section



  9. Grading

    Snapshot Title: Grading
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    This bed is graded.



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Graded bed in Tonoloway Formation
    Image Owner: Callan Bentley



    Description:

    This bar is 1 cm wide.



  11. Calcite

    Snapshot Title: Calcite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Meta limestone!



  12. Chlorite

    Snapshot Title: Chlorite
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Green color comes from chlorite



  13. Garnet

    Snapshot Title: Garnet
    Taken by: Callan Bentley

    Image: Castner Marble
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Porphyroblast



  14. Cavelet

    Snapshot Title: Cavelet
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    Little overhang.



  15. Area 4

    Snapshot Title: Area 4
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  16. Area 3

    Snapshot Title: Area 3
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  17. Area 2

    Snapshot Title: Area 2
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  18. Area 1

    Snapshot Title: Area 1
    Taken by: Callan Bentley

    Image: Migmatite
    Image Owner: Robin Rohrback-Schiavone



    Description:

    For student analysis.



  19. Fern leaflet

    Snapshot Title: Fern leaflet
    Taken by: Callan Bentley

    Image: Plant Fossils in the Allegheny Formation
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Neuropteris?



  20. Title

    Snapshot Title: Title
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    This is what you're looking at.



  21. Pro-talus rampart?

    Snapshot Title: Pro-talus rampart?
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    I think that's what this feature is.



  22. Person

    Snapshot Title: Person
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    contemplating Helen Lake



  23. Rockslide

    Snapshot Title: Rockslide
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    Fresh Gog quartzite is pinkish white. Older boulders get covered in black and green lichens.



  24. Tipover Trace?

    Snapshot Title: Tipover Trace?
    Taken by: Callan Bentley

    Image: Peach Tree Rock
    Image Owner: Joshua Benton



    Description:

    Is this damage from when the rock tipped over?



  25. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross section, original CaCO3 material remains (white), unlike most fossils in this rock, where it has been leached away to leave a mold.



  26. Shelly material

    Snapshot Title: Shelly material
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    At the heart of a carbonate (siderite) nodule, apparently



  27. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Nice example of how joint-facilitated fluid flow can alter a block of rock from the outside, in.



  28. Weathering rind

    Snapshot Title: Weathering rind
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Nice example of how joint-facilitated fluid flow can alter a block of rock from the outside, in.



  29. Cactus "raisins"

    Snapshot Title: Cactus "raisins"
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    The Opuntia "beavertail" paddles are wrinkly during winter due to relative dessication during the winter months.



  30. Cactus fruits

    Snapshot Title: Cactus fruits
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Opuntia is the genus of this native cactus species.



  31. Shelly bed

    Snapshot Title: Shelly bed
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    This block contains a shell-rich layer, here exposed in "map view" (plan view), as opposed to in cross-section.



  32. Shell bed

    Snapshot Title: Shell bed
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    This piece contains the trace of a bed rich in shelly material (about the only way to detect bedding in this unit) exposed on two faces.



  33. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold (partial)



  34. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold



  35. Siderite nodules

    Snapshot Title: Siderite nodules
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Characteristic of the Mahantango.



  36. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Curved arcs, gradually changing in curvature



  37. Shard

    Snapshot Title: Shard
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    of a beer bottle?



  38. Mud dauber

    Snapshot Title: Mud dauber
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Wasp nest



  39. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Columnal, viewed end-on.



  40. Crinoid stems

    Snapshot Title: Crinoid stems
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross-section, end on.



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