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Callan Bentley's Snapshots

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  1. Scroll right

    Snapshot Title: Scroll right
    Taken by: Callan Bentley

    Image: Conococheague Formation at Mulberry Run, showing stromatolites
    Image Owner: Callan Bentley



    Description:

    Take a look at the next outcrop to the right (east): gigapan.com/gigapans/150643



  2. Stromatolite

    Snapshot Title: Stromatolite
    Taken by: Callan Bentley

    Image: Conococheague Formation at Mulberry Run, showing stromatolites
    Image Owner: Callan Bentley



    Description:

    dome-shaped layered microbial mat



  3. Rock hammer

    Snapshot Title: Rock hammer
    Taken by: Callan Bentley

    Image: Conococheague Formation at Mulberry Run, showing stromatolites
    Image Owner: Callan Bentley



    Description:

    to serve as a sense of scale.



  4. Bedding orientation

    Snapshot Title: Bedding orientation
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    320°, 50° (right hand rule)



  5. Coal inclusion

    Snapshot Title: Coal inclusion
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Coalified tree trunk? Deformed coal stratum?



  6. Folding

    Snapshot Title: Folding
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Bedding here is folded to a subvertical (slightly overturned position) - It's 295°, 10° at the lower left of this snapshot (right hand rule), 152°, 90° in the middle right (along the edge of the b...



  7. Folding

    Snapshot Title: Folding
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Looks like some folding (soft sediment deformation??) in this gray shale package.



  8. Marker bed

    Snapshot Title: Marker bed
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Prominent thick-bedded sandstone with central coal seam; stained orange. Hanging wall.



  9. Marker bed

    Snapshot Title: Marker bed
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Prominent thick-bedded sandstone with central coal seam; stained orange. Footwall.



  10. Slip surface

    Snapshot Title: Slip surface
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Running through the middle of this snapshot is a slip surface that dips to the left (west) and offsets a prominent orangey-colored massive sandstone double-bed with a coal seam running through the mid...



  11. Road sign

    Snapshot Title: Road sign
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Showing distances to towns, headed west.



  12. Attitude change

    Snapshot Title: Attitude change
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Big swivel in the orientation of bedding here - close to horizontal at left; gets much steeper to the right.



  13. Channel scour

    Snapshot Title: Channel scour
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Sandstone portion is most obvious, but there are subparallel strata below it too.



  14. The Dragon's Tongue

    Snapshot Title: The Dragon's Tongue
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    Coal bed with forked offshoots



  15. Dan Doctor's rig

    Snapshot Title: Dan Doctor's rig
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    to serve as a sense of scale



  16. Mitch Blake's rig

    Snapshot Title: Mitch Blake's rig
    Taken by: Callan Bentley

    Image: Conemaugh Group, Corridor H
    Image Owner: Callan Bentley



    Description:

    to serve as a sense of scale



  17. Crenulation in shale

    Snapshot Title: Crenulation in shale
    Taken by: Callan Bentley

    Image: Paleoslump and Fluvial Incision Structures, Conemaugh Group, Corridor H, West Virginia
    Image Owner: Marissa Dudek



    Description:

    Small ~1cm wavelength crinkles in the platy shale.



  18. Recumbent folds

    Snapshot Title: Recumbent folds
    Taken by: Callan Bentley

    Image: Paleoslump and Fluvial Incision Structures, Conemaugh Group, Corridor H, West Virginia
    Image Owner: Marissa Dudek



    Description:

    I noted these recumbent folds (axial plane ~horizontal) in the field.



  19. Sectioned clast

    Snapshot Title: Sectioned clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Exposed on 2 surfaces



  20. Dark-colored clast

    Snapshot Title: Dark-colored clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Long axis included w/in the plane of foliation (late Ordovician Taconian Orogeny)



  21. Small mica-rich clast

    Snapshot Title: Small mica-rich clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    w/ reaction halo



  22. Large, mica-rich clast

    Snapshot Title: Large, mica-rich clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    bearing a reaction halo around it



  23. Light-colored clast

    Snapshot Title: Light-colored clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Apparently well rounded.



  24. Hammerhead

    Snapshot Title: Hammerhead
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    for scale



  25. Shadow

    Snapshot Title: Shadow
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    of the GigaPan



  26. Fresh vs. weathered surfaces

    Snapshot Title: Fresh vs. weathered surfaces
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    This rock rusts!



  27. Lichen

    Snapshot Title: Lichen
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Not clasts



  28. Foliated clast

    Snapshot Title: Foliated clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Where the (coarser; gneissic) foliation internal to the clast is oblique to the regional foliation in the surrounding matrix.



  29. Quartz clast

    Snapshot Title: Quartz clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Oblique to foliation.



  30. Hammer for scale

    Snapshot Title: Hammer for scale
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Here's the top of the hammer handle.



  31. Weathered out clast

    Snapshot Title: Weathered out clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    You can see a little tail of relatively-unweathered biotite-rich clast to the right of the joint trace.



  32. Bird poop

    Snapshot Title: Bird poop
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Probably a heron.



  33. Recessive weathering

    Snapshot Title: Recessive weathering
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Some clasts are less chemically stable than the surrounding matrix, and weather out to make clast-shaped holes in the rock face.



  34. Another reaction halo

    Snapshot Title: Another reaction halo
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Rimming this mica-rich clast



  35. Felsic clast

    Snapshot Title: Felsic clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Mica poor, relative to matrix



  36. Reaction halo

    Snapshot Title: Reaction halo
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Where the clast reacted w/ surrounding matrix.



  37. Fishlike clast

    Snapshot Title: Fishlike clast
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Pointy tip and frayed tail



  38. Elongate, flat dark schist clasts

    Snapshot Title: Elongate, flat dark schist clasts
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    And chunkier light-colored clasts.



  39. Contrasting clasts

    Snapshot Title: Contrasting clasts
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Dark-colored, mica-rich clasts tend to be flattened parallel to the plane of foliation. Lighter colored clasts tend to be more chunky and equant.



  40. Sense of scale

    Snapshot Title: Sense of scale
    Taken by: Callan Bentley

    Image: Sykesville Formation, Chain Bridge Flats, DC
    Image Owner: Callan Bentley



    Description:

    Tip of hammer (the only part that's in focus!)



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