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Callan Bentley's Snapshots

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  1. 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.



  2. 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



  3. 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.



  4. 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.



  5. 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.



  6. 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.



  7. 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.



  8. 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.



  9. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold (partial)



  10. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold



  11. Siderite nodules

    Snapshot Title: Siderite nodules
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Characteristic of the Mahantango.



  12. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Curved arcs, gradually changing in curvature



  13. Shard

    Snapshot Title: Shard
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    of a beer bottle?



  14. Mud dauber

    Snapshot Title: Mud dauber
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Wasp nest



  15. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Columnal, viewed end-on.



  16. Crinoid stems

    Snapshot Title: Crinoid stems
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross-section, end on.



  17. Crinoid stem fragments

    Snapshot Title: Crinoid stem fragments
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External molds



  18. Cross-sectioned fossil

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

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Trilobite shell?
    Spiriferid brachiopod?



  19. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External mold



  20. Trace fossil

    Snapshot Title: Trace fossil
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Feeding burrows



  21. 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.



  22. 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.



  23. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    1 vertical white bar = 1 mm



  24. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Vertical trace fossils



  25. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Which way is up?



  26. Brach

    Snapshot Title: Brach
    Taken by: Callan Bentley

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



    Description:

    Articlulate brachiopod shell



  27. 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



  28. 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.



  29. 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.



  30. 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)



  31. 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.



  32. 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...



  33. 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.



  34. 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.



  35. Shwagerina

    Snapshot Title: Shwagerina
    Taken by: Callan Bentley

    Image: Fusulinid rich sediment
    Image Owner: Callan Bentley



    Description:

    Classic, huge Permian fusulinid foram.



  36. Randolph Macon

    Snapshot Title: Randolph Macon
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    Military academy in Front Royal.



  37. Blue Ridge

    Snapshot Title: Blue Ridge
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    The Blue Ridge lies to the east/southeast.



  38. Steeply dipping

    Snapshot Title: Steeply dipping
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    These slabs of Silurian quartz arenite dip steeply NW toward the axis of the Massanutten Synclinorium.



  39. Rock climber

    Snapshot Title: Rock climber
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    Headed up



  40. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Helderberg limestones, Fort Valley Road, Virginia
    Image Owner: Callan Bentley



    Description:

    Each horizontal white/black bar is 10 cm long.



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