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Group: Mid-Atlantic Geo-Image Collection (M.A.G.I.C.)

Metamorphic Rocks

957d7c9ce5deee54b6752318074d5207

70 GigaPansViews

Metamorphic rocks at outcrop and hand sample scales.

Created by
Robin Rohrback-Schiavone
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1.03823 gigapixels
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184
Dated added
November 18, 2012
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geology, macro, nature
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  1. Historic mill at the water gap where Broad Run flows across Bull Run Mountain at the eastern Blue Ridge / Culpeper Basin boundary.

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        March 12, 2013
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  2. "Gateway to the Blue Ridge on I-66..."

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  3. Metamorphosed mudstone, stratigraphically above (east) of the Weverton Formation here in the easternmost Blue Ridge province. Exposure is on the railroad tracks just north of Chapman's Mill, at Thoroughfare Gap, Virginia.

  4. Scale at top is in centimeters.

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        February 28, 2013
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  5. This outcrop of the late Ordovician Martinsburg Formation is located on Route 644 in Shenandoah County, about 20 feet above the North Fork of the Shenandoah River. GigaPan Stitch seems to have had some issues putting it together, which is frustrating. Still, there's a lot to be seen. At this outcrop, bedding is o...

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  6. 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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        February 10, 2013
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  7. This amazing piece of float was located under the Route 15 Bridge in Point of Rocks, MD. My current thinking is that the lower left corner is Catoctin formation but I am scratching my head over the upper right portion. Perhaps it is also Catoctin Metabasalt just with a different, more rigid consistancy. However, the p...

  8. This is an exposure of the Catoctin formation at Point of Rocks in Maryland, on the north bank of the Potomac River. Point of Rocks is a prominent water gap cut by the Potomac River. The Catoctin formation is Neoproterozoic in age and was erupted as a series of flood basalts during the breakup of the Mesoproterozoic su...

  9. The Rocky Islands are exposures of Proterozoic-age metagraywacke of the Mather Gorge Formation. Graywacke is a "dirty" sandstone deposited by turbidity currents in submarine fans (a.k.a. "abyssal fans"), which are essentially big piles of sediment in deep ocean basins. This is likely the original enviro...

  10. There is one rock exposed along the Billy Goat Trail which is a bit more enigmatic. It is amphibolite, a metamorphic rock very rich in the mineral amphibole (a.k.a. hornblende), which shows up as black in this picture. The white portions of the rock are plagioclase feldspar. This is a very mafic metamorphic rock, with ...

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