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You are browsing the archive for 16 May 2012 - Mountain Beltway.

16 May 2012

Contemplating the IARC-JAXA graph

One of the ~350 or so blogs I subscribe to is Arctic Sea Ice by Neven. Today, he put up a post highlighting new daily data from IARC-JAXA, a collaboration between the International Arctic Research Center (IARC) at the University of Alaska-Fairbanks and the Japan Aerospace Exploration Agency (JAXA).¬† Check it out. Here’s a couple of things I was struck by: The annual variation between summer and winter ice cover …

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Brecciation & percussion in Antietam Formation

Further upstream from the Skolithos and the snake and the diabase rip-rap… The field review team wandered down onto a creekside outcrop of Antietam Formation. The Antietam is a quartz sandstone, with variable levels of deformation, depending on where you look. In some places, it has been gently strained with the little Skolithos tubes taking on elliptical cross sections, or the individual sand grains undergoing a moderate amount of pressure …

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