Have long thought it a useful informal term but had no idea of its being under serious consideration by geologists. . ..
http://dotearth.blogs.nytimes.com/2.../?smprod=nytcore-ipad&smid=nytcore-ipad-share
http://dotearth.blogs.nytimes.com/2.../?smprod=nytcore-ipad&smid=nytcore-ipad-share
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