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Callan Bentley's Snapshots

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  1. Fern leaflet

    Snapshot Title: Fern leaflet
    Taken by: Callan Bentley

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



    Description:

    Neuropteris?



  2. Title

    Snapshot Title: Title
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    This is what you're looking at.



  3. 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.



  4. Person

    Snapshot Title: Person
    Taken by: Callan Bentley

    Image: Helen Lake
    Image Owner: Callan Bentley



    Description:

    contemplating Helen Lake



  5. 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.



  6. 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?



  7. 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.



  8. 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



  9. 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.



  10. 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.



  11. 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.



  12. 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.



  13. 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.



  14. 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.



  15. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold (partial)



  16. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold



  17. Siderite nodules

    Snapshot Title: Siderite nodules
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Characteristic of the Mahantango.



  18. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Curved arcs, gradually changing in curvature



  19. Shard

    Snapshot Title: Shard
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    of a beer bottle?



  20. Mud dauber

    Snapshot Title: Mud dauber
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Wasp nest



  21. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Columnal, viewed end-on.



  22. Crinoid stems

    Snapshot Title: Crinoid stems
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross-section, end on.



  23. Crinoid stem fragments

    Snapshot Title: Crinoid stem fragments
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External molds



  24. Cross-sectioned fossil

    Snapshot Title: Cross-sectioned fossil
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Trilobite shell?
    Spiriferid brachiopod?



  25. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External mold



  26. Trace fossil

    Snapshot Title: Trace fossil
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Feeding burrows



  27. Scale bar

    Snapshot Title: Scale bar
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Each black / white bar is 10 cm in length.



  28. Scale pencil

    Snapshot Title: Scale pencil
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Each black bar is 1 cm long.



  29. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    1 vertical white bar = 1 mm



  30. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Vertical trace fossils



  31. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Which way is up?



  32. Brach

    Snapshot Title: Brach
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Articlulate brachiopod shell



  33. Thin sediment load

    Snapshot Title: Thin sediment load
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Mostly (upper section) sparry calcite



  34. One more

    Snapshot Title: One more
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    The sediment fill in this one appears graded.



  35. Another one

    Snapshot Title: Another one
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Partially-sediment filled shell.



  36. Geopetal / paleohorizontal structure

    Snapshot Title: Geopetal / paleohorizontal structure
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    1/3 sediment (bottom); 2/3 sparry calcite (top)



  37. Geopetal and paleohorizontal structure

    Snapshot Title: Geopetal and paleohorizontal structure
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Half-sediment filled shell, sparry calcite above.



  38. Geopetal structure

    Snapshot Title: Geopetal structure
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    The bottom 30% of this shell is filled with gray sediment. The horizontal top of this sediment is a paleo-horizontal level, and the empty space above has been filled with sparry calcite, so you can te...



  39. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Brachiopods and Bivalve Mollusks
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This is a sense of scale.



  40. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Fusulinid rich sediment
    Image Owner: Callan Bentley



    Description:

    w/ a little bud on the right.



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