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Callan Bentley's Snapshots

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  1. 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.



  2. 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.



  3. 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.



  4. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold (partial)



  5. Crinoid columnal

    Snapshot Title: Crinoid columnal
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Lengthwise, external mold



  6. Siderite nodules

    Snapshot Title: Siderite nodules
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Characteristic of the Mahantango.



  7. Trace fossils

    Snapshot Title: Trace fossils
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Curved arcs, gradually changing in curvature



  8. Shard

    Snapshot Title: Shard
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    of a beer bottle?



  9. Mud dauber

    Snapshot Title: Mud dauber
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Wasp nest



  10. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Columnal, viewed end-on.



  11. Crinoid stems

    Snapshot Title: Crinoid stems
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    In cross-section, end on.



  12. Crinoid stem fragments

    Snapshot Title: Crinoid stem fragments
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External molds



  13. Cross-sectioned fossil

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

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Trilobite shell?
    Spiriferid brachiopod?



  14. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    External mold



  15. Trace fossil

    Snapshot Title: Trace fossil
    Taken by: Callan Bentley

    Image: Mahantango Formation
    Image Owner: Callan Bentley



    Description:

    Feeding burrows



  16. 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.



  17. 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.



  18. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    1 vertical white bar = 1 mm



  19. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Vertical trace fossils



  20. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Bliss Sandstone
    Image Owner: Joshua Villalobos



    Description:

    Which way is up?



  21. Brach

    Snapshot Title: Brach
    Taken by: Callan Bentley

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



    Description:

    Articlulate brachiopod shell



  22. 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



  23. 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.



  24. 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.



  25. 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)



  26. 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.



  27. 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...



  28. 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.



  29. 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.



  30. Shwagerina

    Snapshot Title: Shwagerina
    Taken by: Callan Bentley

    Image: Fusulinid rich sediment
    Image Owner: Callan Bentley



    Description:

    Classic, huge Permian fusulinid foram.



  31. Randolph Macon

    Snapshot Title: Randolph Macon
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    Military academy in Front Royal.



  32. 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.



  33. 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.



  34. Rock climber

    Snapshot Title: Rock climber
    Taken by: Callan Bentley

    Image: Buzzard Rocks
    Image Owner: Callan Bentley



    Description:

    Headed up



  35. 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.



  36. Bedding  (shallow apparent dip)

    Snapshot Title: Bedding (shallow apparent dip)
    Taken by: Callan Bentley

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



    Description:

    090° / 38°



  37. Foliation (steep planar feature here)

    Snapshot Title: Foliation (steep planar feature here)
    Taken by: Callan Bentley

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



    Description:

    054° / 90°



  38. Prominent joint set

    Snapshot Title: Prominent joint set
    Taken by: Callan Bentley

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



    Description:

    (widely spaced, divides outcrop into "thirds," left to right): 142° / 84°



  39. Pencil for scale

    Snapshot Title: Pencil for scale
    Taken by: Callan Bentley

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



    Description:

    Each black bar is 1 cm long.



  40. Crinoid stem

    Snapshot Title: Crinoid stem
    Taken by: Callan Bentley

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



    Description:

    !



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