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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.
12 June 2015
Friday fold: Flow banding in obsidian, Newberry Volcano National Monument, Oregon
Lockwood Dewitt is the purveyor of this week’s Friday fold ensemble: All these folds are primary (not tectonic) in nature: they are flow banding of the viscous lava that oozed out to make the Big Obsidian Flow at Newberry. And closer in: One more: Awesome stuff! Thanks for sharing, Lockwood! Happy Friday, everyone!
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: 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. It’s even …