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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 …

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12 February 2014

Fossil clams at Devil’s Coulee, Alberta

At the eroded gully known as Devil’s Coulee in Alberta, you can find armored mudballs, dinosaur fossils (including eggshell), and even marine clams at higher levels in the sequence. Check out these lovely beasts: They lived and died on the western shore of the Western Interior Seaway during the Cretaceous period of geologic time. My Canadian Rockies field geology students visited this site in 2012. I’m taking students back again …

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10 February 2014

Refuge, by Terry Tempest Williams

When Michael Collier came to visit last year, he recommended a couple of books to me. I finally got around to reading the first of them – Refuge, a memoir mixed with natural history of Utah by Terry Tempest Williams. The arc of the story is essentially twofold: the women in Williams’ family get cancer, and get treated for cancer (mastectomies, chemo, nutritional supplements to negate the nausea of the …

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7 February 2014

Friday fold: Hartland Quay, Devon

I ran out of folds last December, I asked for help on Twitter. Laura Hamilton was among the first to respond, with a link to this image: @callanbentley Hartland Quay, Devon UK. Huuuuge chevron folds! pic.twitter.com/7bhRfLib9Y — lau.rah (@hammijam) December 23, 2013 Thanks, Laura, for another great image!

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5 February 2014

The Story of Earth, by Robert Hazen

Callan reviews Bob Hazen’s latest book, “The Story of Earth,” a history of our planet that emphasizes the coevolution of minerals and life.

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3 February 2014

Ice seeps along Passage Creek

This past week, there’s been a beautiful sight along the stretch of the Fort Valley Road that goes past the Blue Hole section of Passage Creek. Click to enlarge Ice has been forming beautiful forms as groundwater seeps out along bedding planes in the Massanutten Sandstone (a Silurian-aged quartz arenite, folded during late Paleozoic Alleghanian deformation). At this site, the bedding dips moderately to the south. This is close to …

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