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Sulfuric acid altered rock. Groundwater leaching through cracks is precipitating melanerite (white iron sulfate) on the outcrop face.
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- 37
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- 51
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Columnar jointing in Mundy Breccia (intruded by Red Bluff Granite) seen at this site.
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- 26
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- Klingle Valley metaconglomerate, Laurel Formation, Rock Creek Shear Zone, Washington, DC by Callan Bentley
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Strained metaconglomerate that crops out in a stream in Klingle Valley, DC. Note the prominent granite intrusion. PINK = Granite contact BLUE = Sericite after staurolite pseudomorphs YELLOW = Outlines of stretched clasts within the metaconglomerate GREEN = Edges of lichens growing on the surface of the outcrop ...
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- Klingle Valley metaconglomerate, Laurel Formation, Rock Creek Shear Zone, Washington, DC by Callan Bentley
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Strained metaconglomerate that crops out in a stream in Klingle Valley, DC. Note the prominent granite intrusion. Compare with this annotated view: gigapan.com/gigapans/128969 Or view them both simultaneously in the comparative viewer from GIGAmacro.com: www.gigamacro.com/gigamacro_viewer/gigama
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- 33
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A big chunk of granite that makes up some archways in the gardens. I think it's from Texas??? I'll double check that and update when I learn more.
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- 333
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As North America collided with the Chopawamsic Terrane during the Taconian orogeny, temperatures within the crust started to rise. As things got warmer, partial melting occured. Minerals present in the graywacke that had low melting temperatures, like quartz, potassium feldspar, and muscovite mica (felsic minerals) all...
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- 361
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Thin section of the Middlefield Granite from Glendale Falls, Middlefield, Massachusetts. Granite intrudes the Rowe Schist and Moretown Formation at their contact, which is interpreted as a Taconic thrust. The granite is approximately 447 +/- 3 Ma from a zircon evaporation age, indicating that Taconic thrusting is older...
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- 94
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Moro Rock is a large granite dome in Sequoia National Park that provides an excellent 360 degree vantage point of some beautiful areas of King's Canyon and Sequoia National Parks as well as much of the surrounding Sierra Nevada Range. When the air was more clear, Moro Rock provided a view of the Coastal Range about 10...
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- 158
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About the subject: The Stawamus Chief, or “The Chief”, as it is known in BC, is named after the First Nation village on the Squamish River. It is a 700 meter high granite monolith that dominates the town of Squamish on the Sea to Sky highway on the way to Whistler BC. The main vertical face is 450 meters high. Th...
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A view of the Crazy Horse rock sculpture & monument on June 2, 2012, during the Volksmarch hike.
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