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25 January 2019

Friday folds: more Marli Miller

Four Friday folds from Marli Miller’s online photo archive of geological images.


14 February 2014

Friday fold: Valentine’s Day at Newberry Caldera’s big obsidian flow

Scott Johnson contributed this special “Valentine’s Day” edition of the Friday fold: a lovely primary igneous structure that evokes a heart: That’s a close-up view (lens cap for scale) that Scott took when he GigaPanned this feature: [gigapan id=”137203″] link … the big obsidian flow at Newberry Crater in Oregon. That’s a really dry lava flow that oozed out of the Earth sometime in the past thousand years or so. …