M.A.G.I.C. Outcrops
200 GigaPansViews
Outcrops, road cuts, rock gardens, and other large exposures.
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Weathering pits called opferkessel form atop rock exposures due to chemical and physical weathering. They may superficially resemble potholes, but are not caused by vortices of swirling water "drilling" into the rock. The water trapped in the opferkessel may host small ecosystems with surprising organisms.
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An exposure of the Mather Gorge Formation, downstream of the "emergency exit" trail off Billy Goat Trail loop A, and upstream of the first sandy beach. Immediately upstream of this outcrop is a prominent belt of amphibolite, and there are large angular amphibolite boudin blocks embedded in this strange rock. ...
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Rhythmites are rhythmically-bedding sedimentary deposits, deposited in a sedimentary basin with some regularly-shifting condition like tidal cycles or day/night changes. The gigapan shows an outcrop of the Konnarock Formation, a bit east of Konnarock, Virginia, in the Blue Ridge province. They are Proterozoic in age. T...
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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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Exposed on the northern bank of the Chesapeake and Ohio Canal near the downstream end of "Widewater" (upstream of the Old Anglers Inn access point), these rocks are the result of ancient mountain-building processes. These rocks, the Mather Gorge Formation, were originally deposited as layers of sand and mud i...
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Exposed on the northern bank of the Chesapeake and Ohio Canal near the downstream end of "Widewater" (upstream of the Old Anglers Inn access point), this antiform is the result of ancient mountain-building processes. A fold that goes up in the middle is called an "antiform," and if there is stratigr...
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Looking downstream on the Potomac River from the southern end of Billy Goat Trail, loop A, in Chesapeake and Ohio Canal National Historical Park, Maryland. The other side of the river is Virginia. On the hill is Madeira School, and the confluence with Difficult Run is directly across the river in the narrow valley. Roc...
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Along the Rockfish River, south of Charlottesville, Virginia, in the Blue Ridge province, there is a gorgeous quarry exposure of the Rockfish Conglomerate, a Neoproterozoic matrix-supported conglomerate with a mix of rounded and angular clasts, perhaps indicative of ancient (Snowball Earth) glacial outwash.
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Anticline / syncline pair, new New Route 55, west of Moorfield, West Virginia
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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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