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29 May 2022

Accretionary wedge turbidites from the Lost Coast

The Lost Coast of northern California shows geological evidence of deep sea turbidity current sedimentation, tectonic accretion during Mesozoic subduction, and then isostatic uplift interacting with shoreline erosion. Check out a few photographs taken by Callan’s wife on a recent backpacking trip through the region.


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16 May 2022


On April 25th, it was announced that Elon Musk had arranged to buy the social media company Twitter. He had just attained majority shareholder status a few weeks earlier. I’ve been an avid Twitter user for twelve years, accruing 11.5K followers over that interval, and very much enjoying the conversation — but I decided to leave the service when the sale was announced. Musk has articulated both an interest in …


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13 May 2022

Super Volcanoes, by Robin George Andrews

Callan reviews the debut book by volcanologist Robin George Andrews. It details the diverse eruptive histories of Kilauea, Yellowstone, Ol Doinyo Lengai, the oceanic ridge system, our Moon, the planets Mars and Venus, and the cryovolcanoes of the outer solar system moons.


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6 May 2022

Book report

Underfoot: A Geologic Guide to the Appalachian Trail, by V. Collins Chew Published in 1988 by the Appalachian Trail Conference, this volume is a very AT-focused look at east coast geology. It’s also out of date, and a little hand-wringing when it comes to making clear conclusive statements about the arc of geologic history. The summary of geologic events is written for the beginner, not the professional. There’s lots of …


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