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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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- Contact between Tensleep Formation & Goose Egg Formation, east of Shell, Wyoming by Callan Bentley
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West of Shell, Wyoming, on route 14, there is a lovely exposure showing the tilted stratigraphic contact between the lower Tensleep Formation (purple; Pennsylvanian period) underneath Goose Egg Formation (orange/tan; Permian to Triassic in age). The contact dips to the west because it has been deformed during Laramide ...
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At "Blue Hole," the northern end of Massanutten Mountain and the valley of Passage Creek (Fort Valley), a fault zone distrupts bedding in the quartz sandstone (with some associated quartz pebble conglomerate and shale) of the Massanutten Formation.
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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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This is a view on Sunday, April 10, at about 10am, to the valley north of Old Rag Mountain, in Shenandoah National Park, Virginia
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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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