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Callan Bentley's Snapshots

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  1. 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



  2. stromatolite

    Snapshot Title: stromatolite
    Taken by: Callan Bentley

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



    Description:

    algal mound



  3. 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.



  4. Rip-ups

    Snapshot Title: Rip-ups
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback-Schiavone



    Description:

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



  5. O2

    Snapshot Title: O2
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback-Schiavone



    Description:

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



  6. Crossbeds

    Snapshot Title: Crossbeds
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback-Schiavone



    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...



  7. Mudchips & crossbeds

    Snapshot Title: Mudchips & crossbeds
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback-Schiavone



    Description:

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



  8. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Grinnell Formation Quartzite
    Image Owner: Robin Rohrback-Schiavone



    Description:

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



  9. Sutured grain boundary

    Snapshot Title: Sutured grain boundary
    Taken by: Callan Bentley

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



    Description:

    Evidence of pressure solution



  10. 120 degree fractures

    Snapshot Title: 120 degree fractures
    Taken by: Callan Bentley

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



    Description:

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



  11. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

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



    Description:

    This bar serves as a sense of scale.



  12. 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.



  13. 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.



  14. 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.



  15. 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.



  16. 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.



  17. Fossil

    Snapshot Title: Fossil
    Taken by: Callan Bentley

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



    Description:

    Shelly material



  18. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

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



    Description:

    Scale



  19. 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.



  20. 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



  21. 1 cm

    Snapshot Title: 1 cm
    Taken by: Callan Bentley

    Image: Shawangunk Conglomerate, Pennsylvania
    Image Owner: Callan Bentley



    Description:

    Scale



  22. Phenocryst

    Snapshot Title: Phenocryst
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Quartz (note the conchoidal fracture).



  23. Lithic

    Snapshot Title: Lithic
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

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



  24. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Bishop Tuff
    Image Owner: Robin Rohrback-Schiavone



    Description:

    This box is 1 cm wide.



  25. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Rockfish Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    To see a piece of the Catoctin greenstone from this site in "macro" GigaPan view, click here: gigapan.com/gigapans/149431



  26. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Rockfish Gap, Virginia
    Image Owner: Callan Bentley



    Description:

    To see a piece of the Catoctin greenstone from this site in "macro" GigaPan view, click here: gigapan.com/gigapans/149431



  27. 1 cm Scale

    Snapshot Title: 1 cm Scale
    Taken by: Callan Bentley

    Image: Chip suite, El Paso region geology
    Image Owner: Callan Bentley



    Description:

    This box is 1 centimeter across



  28. Partly lithified cluster

    Snapshot Title: Partly lithified cluster
    Taken by: Callan Bentley

    Image: Coarse Ooids
    Image Owner: Robin Rohrback-Schiavone



    Description:

    oolitic limestone in the making.



  29. Pyrite

    Snapshot Title: Pyrite
    Taken by: Callan Bentley

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



    Description:

    Small pyrite crystal, surrounded by a rusty aura.



  30. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ball and pillow
    Image Owner: Callan Bentley



    Description:

    This is 1 cm long.



  31. Sample collected here

    Snapshot Title: Sample collected here
    Taken by: Callan Bentley

    Image: Ball and pillow
    Image Owner: Callan Bentley



    Description:

    :)



  32. Square hole

    Snapshot Title: Square hole
    Taken by: Callan Bentley

    Image: Mudcracks from the Belt Supergroup
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Suspiciously square shaped... former halite cast? or just geo-pareidolia?



  33. Book return

    Snapshot Title: Book return
    Taken by: Callan Bentley

    Image: Fort Valley Community Center and Library
    Image Owner: Callan Bentley



    Description:

    Drop box!



  34. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Ash and Lapilli from Kilbourne Hole
    Image Owner: Robin Rohrback-Schiavone



    Description:

    Petri dish diameter is 9 cm.



  35. Laminations

    Snapshot Title: Laminations
    Taken by: Callan Bentley

    Image: Witvlei Group Stromatolites
    Image Owner: Callan Bentley



    Description:

    Microbial mats growing upward (toward sunlight) give this rock its distinctive "onion-skin" domes.



  36. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Witvlei Group Stromatolites
    Image Owner: Callan Bentley



    Description:

    This blue bar is 1 cm long.



  37. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample of graywacke collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  38. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample of graywacke collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  39. Sample

    Snapshot Title: Sample
    Taken by: Callan Bentley

    Image: Martinsburg Formation exposed at Staunton, Virginia
    Image Owner: Callan Bentley



    Description:

    A sample collected at this site may be seen in macro view here:
    gigapan.com/gigapans/145682



  40. Scale

    Snapshot Title: Scale
    Taken by: Callan Bentley

    Image: Folded calc-silicate
    Image Owner: Callan Bentley



    Description:

    This bar is 1 centimeter long.



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