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Callan Bentley's Snapshots

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  1. Clastic dike?

    Snapshot Title: Clastic dike?
    Taken by: Callan Bentley

    Image: Black Cretaceous Shales - Sheep Mountain Anticline, WY
    Image Owner: Jeffrey Rollins



    Description:

    This little "lightning bolt" shaped bit suggests to me a clastic dike, infilled w/ light-colored fluidized sand (also seen along the trace of the fault to the lower right).



  2. Normal fault

    Snapshot Title: Normal fault
    Taken by: Callan Bentley

    Image: Black Cretaceous Shales - Sheep Mountain Anticline, WY
    Image Owner: Jeffrey Rollins



    Description:

    Lovely set of marker beds, showing apparent normal offset.



  3. iPhone

    Snapshot Title: iPhone
    Taken by: Callan Bentley

    Image: Earthquake Lake Scarp - Hebgen Lake Road, MT
    Image Owner: Jeffrey Rollins



    Description:

    For scale



  4. Bold rust

    Snapshot Title: Bold rust
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    On a joint surface.



  5. Scours

    Snapshot Title: Scours
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Several preserved asymmetric trough-like scours here.



  6. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Paleocurrent flow from right (east) to left (west).



  7. Rust

    Snapshot Title: Rust
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    More iron oxide staining on joint faces.



  8. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Pretty clear truncation. Strata are not overturned.



  9. Iron oxide staining

    Snapshot Title: Iron oxide staining
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Successive flow fronts mineralized on a joint surface.



  10. Veins cutting bedding

    Snapshot Title: Veins cutting bedding
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Nice example of the phenomenon.



  11. Interesting bedding structure

    Snapshot Title: Interesting bedding structure
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Not sure what's going on here. Pretty bold contrast, though.



  12. Quartz vein

    Snapshot Title: Quartz vein
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Crystal structure appears to the naked eye to be more or less homogeneous across this feature.



  13. Breakage

    Snapshot Title: Breakage
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Quartz veins can serve as planes of weakness, facilitating modern re-cracking in the same spot as ancient fractures.



  14. Dips

    Snapshot Title: Dips
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Both the quartz veins and bedding dip to the east, but at different angles of inclination.



  15. Fault

    Snapshot Title: Fault
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Right (east) side up, relative to left (west).



  16. Sugary texture

    Snapshot Title: Sugary texture
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Fused quartz grains - definitely a metamorphic rock.



  17. Deformation

    Snapshot Title: Deformation
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    small-offset fold/fault pair



  18. Pine cone

    Snapshot Title: Pine cone
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    This is in focus...



  19. Cross-bedding

    Snapshot Title: Cross-bedding
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Visible here and there.



  20. Sheared primary sedimentary structures

    Snapshot Title: Sheared primary sedimentary structures
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Possible scours + cross-bedding, sheared (top to the left; east over west) to oversteepen the right side.



  21. Quartz vein

    Snapshot Title: Quartz vein
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Offsetting bedding (black lines are traces of bedding), apparently with a east-over-west kinematic sense.



  22. Pencil for scale

    Snapshot Title: Pencil for scale
    Taken by: Callan Bentley

    Image: Weverton Formation exposed at Thoroughfare Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    Each black bar on the pencil is 1 cm.



  23. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation, showing Reynolds Limestone Member
    Image Owner: Callan Bentley



    Description:

    At this wall: www.gigapan.com/gigapans/181674



  24. A closer look

    Snapshot Title: A closer look
    Taken by: Callan Bentley

    Image: Mauch Chunk Formation
    Image Owner: Joshua Benton



    Description:

    At this wall: www.gigapan.com/gigapans/181674



  25. Convolute contact

    Snapshot Title: Convolute contact
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    between shalier layer and overlying massive, fossiliferous layer.



  26. Articulate brachiopod - both valves

    Snapshot Title: Articulate brachiopod - both valves
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Still articulated! (buried alive)



  27. Cavity fill

    Snapshot Title: Cavity fill
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    A nice geopetal indicator: the lower part of the shell is full of sediment; the upper (formerly empty) part is filled with sparry calcite.



  28. Cavity fill

    Snapshot Title: Cavity fill
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    A nice geopetal indicator: the lower part of the shell is full of sediment; the upper (formerly empty) part is filled with sparry calcite.



  29. Gastropod

    Snapshot Title: Gastropod
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    (fossil)



  30. Gastropod

    Snapshot Title: Gastropod
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    (fossil)



  31. Gastropod

    Snapshot Title: Gastropod
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    (fossil)



  32. Strophomenid brachiopod

    Snapshot Title: Strophomenid brachiopod
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    (fossil)



  33. Strophomenid bachiopod

    Snapshot Title: Strophomenid bachiopod
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    (fossil)



  34. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Reynolds Limestone member of the Mauch Chunk Formation, Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    Each of the black bars on the side of this pencil is 1 centimeter in length.



  35. A closer look
  36. A closer look
  37. Spechty Kopf diamictite

    Snapshot Title: Spechty Kopf diamictite
    Taken by: Callan Bentley

    Image: Latest Devonian Spechty Kopf formation roadcut on Corridor H, West Virginia
    Image Owner: Callan Bentley



    Description:

    The next unit down in the sequence is this diamictite: www.gigapan.com/gigapans/181670



  38. Clast w/ apparent faceted shape

    Snapshot Title: Clast w/ apparent faceted shape
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, exposed on Corridor H, West Virginia (second berm)
    Image Owner: Callan Bentley



    Description:

    Possible dropstone.



  39. Outsized clast

    Snapshot Title: Outsized clast
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, exposed on Corridor H, West Virginia (second berm)
    Image Owner: Callan Bentley



    Description:

    Possible dropstone.



  40. Big quartz pebble

    Snapshot Title: Big quartz pebble
    Taken by: Callan Bentley

    Image: Spechty Kopf Diamictite, exposed on Corridor H, West Virginia (second berm)
    Image Owner: Callan Bentley



    Description:

    Possible dropstone.



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