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Calcite displays at least three different crystal habits and two different colors on one small hunk of limestone. Collected in the Keyser Limestone along the Great Allegheny Passage in La Vale, MD.
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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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Myrtle Beach, a tributary of the Smith River, lies 15 minutes north of Gasquet, CA in the Six Rivers National Forest. This gravel lay 15' above that day's water line. Compare it with the coarser gravel closer to the water line here: gigapan.com/gigapans/125977
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Sand from Scientists' Cliffs, Maryland. For more information on Scientists' Cliffs, including several gigapans of outcrops there, click here: blogs.agu.org/mountainbeltway/2013/03/05/documenting-doomed-outcrops-scientists-cliffs-maryland
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Sand from Clam Beach in Humboldt County, CA. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here: gigamacro.com/gigapixel-macro-imaging-system
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To see this sample under regular lighting, click here: gigapan.com/gigapans/123454 This sample was provided by Dr. Jay Kaufman of the University of Maryland.
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- 236
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Reticulite, also known by the poetic name "thread lace scoria", is the "none more pumice" of glassy volcanic rocks. Like pumice, it is a volcanic glass. Unlike pumice, the gas bubbles in reticulite have all burst, leaving behind only the delicate interstitial mesh. Reticulite forms in particularly vigorous lava foun...
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Liesegang rings from the unit above the Dwyka tillite in Namibia. This sample was provided by Dr. Jay Kaufman of the University of Maryland.
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- 352
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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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Diptera tipulidae Specimen provided by Joseph Cancellare of El Paso Community College. He can be reached by email at stonefly.1@live.com
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