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Garnet porphyroblasts may be seen in the metamorphosed Castner Marble exposed in the eastern Franklin Mountains north of El Paso, Texas.
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Outcrop on the Trans Mountain Highway, Franklin Mountains, West Texas.
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Outcrop on the Trans Mountain Highway, Franklin Mountains, West Texas.
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Primary sedimentary features may be seen in the metamorphosed Castner Marble exposed in the eastern Franklin Mountains north of El Paso, Texas.
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Dr. Jay Kaufman of the University of Maryland, who provided this sample, interprets these to be microbial sulfate reduction spots on the bedding surface of the Neoproterozoic (Cryogenian) Santa Helena Formation of the Bambui Group in south-central Brazil. The microbial spots show clear cores and cortices, which notabl...
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- 233
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Giant oolites from the Beck Spring Formation (ca. 723 Ma) very near Saratoga Springs in Death Valley, California. Data taken from this section and a discussion of the general Neoproterozoic geology of Death Valley can be found in a GSA Bulletin article by Corsetti and Kaufman (2003). To see these ooids in cross s...
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This sample was collected from the Ediacaran Period (ca. 550 Ma) Blueflower Formation in the Mackenzie Mountains of arctic Canada in 1994. The elephant skin is interpreted as the remains of a microbial mat on which, or beneath which, Ediacara organisms lived. This sample was contributed by Dr. Jay Kaufman of the Un...
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This sample was provided by Dr. Jay Kaufman of the University of Maryland.
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Writes Dr. Jay Kaufman of University of Maryland, who contributed this sample: "I had been told that there was pyrobitumen (crystallized oil) as a replacement for ooids in some levels of the Turkut Formation in the Olenek Uplift of arctic Siberia. In the field, I found an abundance of different breccias within the T...
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- 18
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GigapanMagazine.org
vol 3 issue 1
The Great Unconformity - Welcome to the surface of the Earth, approx. 550 million years ago. The first layer of rock, at ground level here, is called the Vishnu Schist. It consists of several complex sets of sedimentary and volcanic that were laid down 1.8 billion years ag...-
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