M.A.G.I.C. Hand Samples
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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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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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The sample is a tubestone stromatolite of the Neoproterozoic Noonday Formation, a post-glacial cap carbonate, from the Queen of Sheba mine in Death Valley. Notably, the inner tube, which appears here as the more resistant portion of the rock and likely rich in silica, co-exists with galena and other sulfide minerals, ...
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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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- 214
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Cross-laminated sandstone composed primarily of well-rounded, coarse sand grains from the base of the Ulveso Formation. The Ulveso Formation has been interpreted as an immature aeolian deposit with a proglacial subaerial origin. This sample may have been deposited during a period of dry, windy conditions preceding the ...
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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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- 210
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A fine-grained carbonate laminite from above the Ghuab glacial formation. It is interpreted as a marine cap carbonate suggestive of rapid enviromental change. Sample is 8.4 cm long. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene...
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A phosphatic (up to 16 wt. %) columnar stromatolite from the ca. 740 Ma Salitre Formation of the Una Group in central Brazil. These stromatolites are similar to those found in post-glacial cap carbonate lithofacies. This sample was provided by Dr. Jay Kaufman of the University of Maryland.
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Sample 17 is a striated and faceted stone embedded in a sandy diamictite matrix. The erosional surfaces of the pebble suggest that it was in direct contact with mobile basal ice. The flattened (faceted) surfaces of the pebble were formed as the pebble scraped along the bedrock beneath the moving basal ice. The striatio...
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Precipitation lamellae from the Society Cliffs Formation on Baffin Island. This sample was provided by Dr. Jay Kaufman of the University of Maryland.
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