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You are browsing the archive for 2010 October 28.

28 October 2010

Accretionary Wedge #28: Deskcrops

In honor of this month’s Accretionary Wedge (geoblog carnival; this month the theme is “deskcrops”), I recorded the following short video, showcasing some samples I have in my office: stromatolite (western Montana), conglomerate (Patagonia), schist (New Hampshire), anorthosite (New York), amygdular meta-basalt (Virginia), amphibolite (California), hematite concretions (eastern Montana), and a stretched-pebble lineated meta-conglomerate (Turkey).

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The tale of the hammerheaded copper tadpole

Okay, now just what the heck is going on in these pictures? (All of them can be enlarged by clicking through.) The photos are different views of the same crystal. It is a broken hexagonal prism of quartz, fading to amethyst at the distal end, found by Doug Dupin of northwest DC during the excavation that led to the Palisades Museum of Prehistory. The crystal is about 3.5 cm long, …

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