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Snapshots

  1. Interesting cobble

    Snapshot Title: Interesting cobble
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    It has stripes, and that is very important!



  2. Epoxepebblite

    Snapshot Title: Epoxepebblite
    Taken by: Chris Fastie

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    Erratic anthropoglomerate diamicton from the post-Quaternary Barco's fault zone.



  3. Kyanite

    Snapshot Title: Kyanite
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    From Baker Mountain, Virginia.



  4. Blue quartz

    Snapshot Title: Blue quartz
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    A characteristic mineral of the Blue Ridge basement complex. Blue color comes from inclusions of titanium minerals.



  5. Petrified wood

    Snapshot Title: Petrified wood
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    Cretaceous aged cypress tree trunks. Coastal Plain.



  6. Graded bed

    Snapshot Title: Graded bed
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    ...in the Konnarock Formation "rhythymites" of southwestern Virginia's Blue Ridge.



  7. Plumose structure

    Snapshot Title: Plumose structure
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    in slate



  8. Mudcracks

    Snapshot Title: Mudcracks
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    in Triassic mudstone/sandstone layers, from the Culpeper Basin.



  9. Tiger beetle

    Snapshot Title: Tiger beetle
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    A visitor, hunting for his lunch!



  10. Excess epoxy

    Snapshot Title: Excess epoxy
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    Someone got a little trigger happy with the epoxy gun, it looks like.



  11. Fault breccia

    Snapshot Title: Fault breccia
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    Dramatic fault breccia of quartzite fragments cemented by manganese oxides. Typical of the Blue Ridge thrust fault.



  12. Felsic dike

    Snapshot Title: Felsic dike
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    ...cutting across mafic boudin.



  13. Epidote crystal fiber lineations

    Snapshot Title: Epidote crystal fiber lineations
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    These "slickensides" formed along a fault surface which is today the top of this block. Movement of the opposite block of rock was roughly towards the camera, which is why the "steps" in the epidote l...



  14. Fold hinge

    Snapshot Title: Fold hinge
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    With multi-layer behavior.



  15. Collapse breccia

    Snapshot Title: Collapse breccia
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    Paleo-karst! An ancient cave in gray limestone collapsed, and calcite (white) was precipitated in the spaces in between the fragments.



  16. Turitella fossils

    Snapshot Title: Turitella fossils
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    in the Aquia Formation sandstone -- the same rock unit quarried to build the White House!



  17. Garnets

    Snapshot Title: Garnets
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    A common metamorphic mineral, seen here in amphibolite.



  18. Skolithos

    Snapshot Title: Skolithos
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    A vertical tube-shaped trace fossil that shows up in the Cambrian period of geologic time. Here, it is evident as a common primary structure in the Antietam Formation quartzite.



  19. Leesburg Conlomerate

    Snapshot Title: Leesburg Conlomerate
    Taken by: Callan Bentley

    Image: "Rocks of Virginia" garden at the DGMR
    Image Owner: Callan Bentley



    Description:

    A "fanglomerate" deposited along the western edge of the normal-fault-bounded Culpeper Basin, a Triassic rift valley in north-central Virginia. Clasts are mainly limestone.