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Geologic map overlay is the 1974 Geologic Map of the Ashby Gap quadrangle, by T.M. Gathright, Jr. and P.G. Nystrom, Jr. You can buy a copy here: www.dmme.virginia.gov/commerce/ProductDetails.aspx?productID=2184
Or you can download a PDF of it here: www.dmme.virginia.gov/commercedocs/RI_36.pdf
The LIDAR...-
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LIDAR imagery provided by Dan Doctor, USGS Reston. This map view shows fine-scale topographic variation along the western Blue Ridge front, where the Blue Ridge geologic / physiographic province meets the easternmost Valley & Ridge province (Shenandoah Valley). The most striking feature is the beautiful expressio...
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Pano taken during a visit by Marine Geology students from Bangor University's School of Ocean Sciences in November 2012. An exposed spot on a windy day resulted in a few stitching problems. The cliffs show spectular fold structures, anticline and syncline. Rocks are sandy turbidites and schistose mudstones.
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Muscovite schist (metamorphosed Harpers Formation?) from Throroughfare Gap / Bull Run Mountain, Virginia, bearing euhedral porphyroblasts of magnetite. Sample measures 8.5 by 2.5 cm. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro...
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Slightly stretched grains in Antietam Formation quartz sandstone, from western Blue Ridge. Depositional age is Cambrian, deformation is related to the late Paleozoic Alleghanian Orogeny. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacr...
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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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This is a classic outcrop in Appalachian stratigraphy. Overall, it shows the transition from the passive margin sedimentation (limestone) of the Cambrian and early Ordovician Sauk and Tippecanoe epeiric seas into the increasing clastic (sand and mud) influence of active margin sedimentation associated with the onset of...
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GigaPan Interrupted - This one had some problems. This is the highest resolution GigaPan I attempted on the trip. It consists of over 620 pics and required both battery changes and memory card changes. There must have been some user error during the interruptions that lead to the results seen here. If anyone can dia...
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GigapanMagazine.org
vol 3 issue 1
One of the jewels of the American West, Havasu Creek is named for the people who have lived along it for at least the last eight hunded years. The Havasupai (the-people-of-the-blue-green-waters) have had a long struggle to hold onto their traditional lands in the face of we...-
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This roadcut, near Alexandria Bay, New York, exposes the "Great Unconformity" between the basal Cambrian Potsdam Sandstone and the underlying Precambrian gneisses of the Frontenac Arch. The unconformity is near the base of the roadcut and can be seen to preserve some evidence of paleotopography on the Cambri...
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