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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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Olivine-rich sand from Pakalakoa Beach near South Point on the big island of Hawai'i. More information on this sand can be found here: www.nvcc.edu/home/cbentley/geoblog/2008/12/green-sands-beach-hawaii.html
The petri dish is 9 cm in diameter.
Image made as part of the MAGIC project (Mid-Atlantic Geo-I...-
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Jay Kaufman of the University of Maryland - College Park loaned us this sample to image. It is a piece of the Ghaub Formation of Namibia, carbonate diamictite with iceberg-rafted debris attributed to the Neoproterozoic "Snowball Earth" glaciation. A prominent dropstone is located in the middle of this face. Sampl...
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Layers of wet sediment were disturbed (those are the saggy layers in the red rock), forming a large pipe that quickly filled with sand. Once lithified (formed into a rock), the layers erode more easily than the pipe of sand, which is often left behind as a large chimney of sandstone. (I need to get some more concre...
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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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Sand from Pays de la Loire, Vendee, Bretignolles-sur-Mer, France. Featuring quartz, almandine, orthoclase, staurolite, clinozoisite, spinel, zircon, rutile, and magnetite. The petri dish is 9 cm in diameter. Sample provided by Siim Sepp of sandatlas.org. Image made as part of the MAGIC project (Mid-Atlantic Ge...
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Sand from Al Madam, Sharjah, UAE. Description to come.
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Sand from Calvert Cliffs State Park, MD. Featuring ilmenite, quartz, garnet, magentite, rutile, and zircon. The petri dish is 9 cm in diameter. Sample provided by Siim Sepp of sandatlas.org. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College'...
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River restoration site at the mouth of the Bear River. Levees in the area were set back from the channel of the Bear River, and a riparian forest was planted in the floodplain. New residential development in the background is Plumas Lake. The Plumas Lake area flooded after levees to the north failed during major sto...
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This is a "doomed" outcrop of the Miocene-aged (~14 Ma) Calvert Formation on the western shore of Chesapeake Bay. "Bed 14," a distinctive fossiliferous unit, is exposed here thanks to the effort of one of the local landowners. In a month or two, this entire outcrop will be permanently covered with "hard stabilization" ...
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