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Antiform and synform in the Mesilla Valley Formation, exposed on the north side of Cristo Rey at the New Mexico / Mexico / Texas border triple point.
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- 114
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- 57
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A recumbent fold is exposed in the walls of an abandoned limestone quarry next to the Shenandoah River in Page County, Virginia.
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A recumbent fold is exposed in the walls of an abandoned limestone quarry next to the Shenandoah River in Page County, Virginia.
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- 528
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Fold Pair in upper Conococheague Formation.
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- 341
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This is a highly deformed section of the Devonian Foreknobs Formation exposed near Bergton Va. The Foreknobs Formation ( formerly known as the Chemung) is a mixed package of brownish red to grey sandstone siltstone shale and minor conglomerate. This formation is part of the Catskill Delta, a shallowing upward sequence...
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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...
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- 548
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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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- 513
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Looking at an anticline in the Ordovician-aged Edinburg Formation from Frederick County, Virginia, on the western shore of Opequon Creek, gazing across into Clarke County. Strata are Ordovician; deformation is Alleghanian (late Paleozoic). Another set of folds is just upstream: gigapan.org/gigapans/120300 ...
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Viewed from Frederick County (Opequon Creek is the dividing line), you can see strata of the Ordovician-aged Edinburg Formation limestones and shales. These anticlines and synclines formed during Alleghanian mountain-building in the late Paleozoic. Another set of folds is just upstream: gigapan.org/gigapans...
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