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The Swift Dam area northwest of Depuyer, Montana, showcases Sever-style mountain building of the Cordilleran fold-and-thrust belt. Here, Mississippian carbonates have been arched eastward along asymmetric anticlines, and thrust over Cretaceous black shales originally deposited in the Western Interior Seaway. Notice how...
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This is the pond on the northern edge of our campus of Northern Virginia Community College (NOVA), south of Little River Turnpike (Route 236) in Annandale, Virginia. See if you can find any geese, herons, turtles, or other critters in this scene! If you find any, please take a "snapshot" of them!
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Stitched using the Gigapan Stitch program from 448 images at fixed focal length, this gigapan shows the building I work in, and the base of the Math, Science, & Engineering Division here at the Annandale campus of NOVA. The image was taken on April 4, 2011, with the cherry trees in full bloom outside.
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The Madison River has incised downward into the northwestern portion of the Madison Range, a Laramide uplift bounded by Basin-and-Range normal faults. Here, the superposition of the river has revealed gorgeous outcrops of Archean basement complex (Wyoming Terrane or Wyoming Craton). Granites, gneisses, and amphibolites...
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Here, in yet another practice gigapan from the Phipps Conservatory in Pittsburgh, PA, I document a plant, and the fence that lives behind it.
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Jay Kaufman of the University of Maryland - College Park loaned us this sample to image. It is a piece of the Ghaub Formation of Namibia, carbonate diamictite with iceberg-rafted debris attributed to the Neoproterozoic "Snowball Earth" glaciation. A prominent dropstone is located in the middle of this face. Sampl...
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Dry fake waterfall at the Phipps Conservatory.
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Also known as the Darton Fault (for Nelson Horatio Darton of the USGS, who pushed for its preservation "from the effects of weathering and the small boy") or the White House Fault (because it runs southeast to underneath the northeast corner of the White House grounds), this reverse fault offsets the nonconformity betw...
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This cherry (?) tree is in full bloom on the Annandale campus of Northern Virginia Community College this week.
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The ancient erosional surface between the Archean rocks of the Wyoming Terrane basement complex and the overlying Flathead Sandstone (Cambrian in age), with a rubbly conglomerate at its base.
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