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Callan Bentley's Snapshots

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  1. Fold hinge

    Snapshot Title: Fold hinge
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    Dismembered due to boudinage



  2. better boudinage

    Snapshot Title: better boudinage
    Taken by: Callan Bentley

    Image: Geology of Pemaquid Point, Maine (east)
    Image Owner: eos101



    Description:

    To have a closer look at the boudinage here, check out this GigaPan: www.gigapan.com/gigapans/157549



  3. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    This red pen serves as a sense of scale.



  4. Another view

    Snapshot Title: Another view
    Taken by: Callan Bentley

    Image: Geology of Pemaquid Point, Maine (west)
    Image Owner: eos101



    Description:

    To see a GigaPan from this point, looking toward the lighthouse: www.gigapan.com/gigapans/157527



  5. Boudin

    Snapshot Title: Boudin
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    A boudin from a stretched granite dike.



  6. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Pemaquid Point, Maine
    Image Owner: Callan Bentley



    Description:

    This red ballpoint pen serves as a sense of scale.



  7. Graded bed

    Snapshot Title: Graded bed
    Taken by: Callan Bentley

    Image: Graded Slate & Graywacke Beds
    Image Owner: Brian Allison



    Description:

    Awesome outcrop; thanks for GigaPanning it!



  8. Contact between beds

    Snapshot Title: Contact between beds
    Taken by: Callan Bentley

    Image: Graded Bedding in the Martinsburg Formation
    Image Owner: Robin Rohrback



    Description:

    The fine grained dark gray material below is the top of one graded bed. The sudden, crisp transition to coarse, light-colored sand marks the bottom of the overlying graded bed.



  9. Flame structures

    Snapshot Title: Flame structures
    Taken by: Callan Bentley

    Image: Graded Bedding in the Martinsburg Formation
    Image Owner: Robin Rohrback



    Description:

    Loading structures



  10. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Graded Bedding in the Martinsburg Formation
    Image Owner: Robin Rohrback



    Description:

    1 cm



  11. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Giant Fusulinids
    Image Owner: Robin Rohrback



    Description:

    This blue bar is 1 cm across.



  12. Schwagerina, a fusilinid foram

    Snapshot Title: Schwagerina, a fusilinid foram
    Taken by: Callan Bentley

    Image: Giant Fusulinids
    Image Owner: Robin Rohrback



    Description:

    Cross-sectioned, with overall spiral shape and internal subdivisions visible.



  13. Cribratina

    Snapshot Title: Cribratina
    Taken by: Callan Bentley

    Image: Cribratina duo
    Image Owner: Callan Bentley



    Description:

    This foram is an index fossil for the Albian age.



  14. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Cribratina duo
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm long.



  15. Trilobite shell

    Snapshot Title: Trilobite shell
    Taken by: Callan Bentley

    Image: Storm deposit in Reedsville Formation
    Image Owner: Callan Bentley



    Description:

    in cross-section



  16. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Storm deposit in Reedsville Formation
    Image Owner: Callan Bentley



    Description:

    This blue box is a 1 cm long scale bar.



  17. Cave

    Snapshot Title: Cave
    Taken by: Callan Bentley

    Image: Conococheague Formation exposed near Mulberry Run, Virginia
    Image Owner: Callan Bentley



    Description:

    Little cave, spewing red clay



  18. stromatolite

    Snapshot Title: stromatolite
    Taken by: Callan Bentley

    Image: Conococheague Formation exposed near Mulberry Run, Virginia
    Image Owner: Callan Bentley



    Description:

    algal mound



  19. Pen for scale

    Snapshot Title: Pen for scale
    Taken by: Callan Bentley

    Image: Conococheague Formation exposed near Mulberry Run, Virginia
    Image Owner: Callan Bentley



    Description:

    A typical ballpoint pen, to help you calibrate your sense of scale.



  20. Rip-ups

    Snapshot Title: Rip-ups
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback



    Description:

    What do these mud-chip rip-up clasts suggest about the depositional energy (current strength) at this site over time?



  21. O2

    Snapshot Title: O2
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback



    Description:

    Were these sediments deposited under oxygenated or anoxic conditions? What evidence supports your conclusion?



  22. Crossbeds

    Snapshot Title: Crossbeds
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback



    Description:

    Is the sample right-side-up or up-side-down? How do you know? Which way was the sediment-depositing current flowing when these grains were laid down? What evidence would you cite in support of your in...



  23. Mudchips & crossbeds

    Snapshot Title: Mudchips & crossbeds
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback



    Description:

    Which way was the current flowing? How had the depositional energy changed?



  24. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback



    Description:

    This scale bar conveys a sense of how big the rock sample is. The blue bars are each 1 centimeter wide.



  25. Sutured grain boundary

    Snapshot Title: Sutured grain boundary
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback



    Description:

    Evidence of pressure solution



  26. 120 degree fractures

    Snapshot Title: 120 degree fractures
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback



    Description:

    Some of the pebbles are cracked due to bedding-perpendicular loading and bedding-parallel extension. σ1 > σ2 = σ3



  27. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Flat Pebble Conglomerate, Gros Ventre Formation
    Image Owner: Robin Rohrback



    Description:

    This bar serves as a sense of scale.



  28. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten Sandstone
    Image Owner: Callan Bentley



    Description:

    This pencil serves as a sense of scale. The black bars along its side are each 1 cm in length.



  29. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten Sandstone
    Image Owner: Callan Bentley



    Description:

    This pencil serves as a sense of scale. The black bars along its side are 1 cm in length each.



  30. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Massanutten Sandstone
    Image Owner: Callan Bentley



    Description:

    This pencil serves as a sense of scale. The black bars on its side are each 1 cm long.



  31. Blocky "needles"

    Snapshot Title: Blocky "needles"
    Taken by: Callan Bentley

    Image: Stylolite in Helderberg Group limestone, West Virginia
    Image Owner: Callan Bentley



    Description:

    Stylolitic surface in detail. Note apparent accumulation of clay (pelitic non-soluble material) along stylolite surface.



  32. Stylolite "needle"

    Snapshot Title: Stylolite "needle"
    Taken by: Callan Bentley

    Image: Stylolite in Helderberg Group limestone, West Virginia
    Image Owner: Callan Bentley



    Description:

    Rock has dissolved along this surface, causing interpenetration of the two strata.



  33. Fossil

    Snapshot Title: Fossil
    Taken by: Callan Bentley

    Image: Stylolite in Helderberg Group limestone, West Virginia
    Image Owner: Callan Bentley



    Description:

    Shelly material



  34. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Stylolite in Helderberg Group limestone, West Virginia
    Image Owner: Callan Bentley



    Description:

    Scale



  35. Sandstone pebble

    Snapshot Title: Sandstone pebble
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    You can see the grains inside it.



  36. Flush grain boundaries

    Snapshot Title: Flush grain boundaries
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    Evidence of pressure solution



  37. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    Scale



  38. Phenocryst

    Snapshot Title: Phenocryst
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback



    Description:

    Quartz (note the conchoidal fracture).



  39. Lithic

    Snapshot Title: Lithic
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback



    Description:

    Fragment of pre-existing rock, caught up in the pyroclastic surge.



  40. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback



    Description:

    This box is 1 cm wide.



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