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29 March 2019

Friday fold: Plunging Purisima

AGU’s Centennial year is also the 35th anniversary of the publication of Clyde Wahrhaftig’s unique field guide to the geology of San Francisco. A team of geologists is updating “A Streetcar to Subduction” for a modern digital audience, and recently did some California field work to visit key sites. Check out one of them here with the Friday fold, as we visit a plunging syncline in the Purisima Formation on the coast near San Mateo.


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7 December 2018

Welcome to D.C. for #AGU2018

A summary of resources to learn about the geology of Washington, D.C. and the surrounding region, in anticipation of AGU’s Fall Meeting being held in the nation’s capital city.


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8 December 2016

Silent samples, holey samples

Two very different samples tell stories that are full of holes. What’s going on with this weathered sandstone? What’s going on with this fossil scallop shell?


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28 December 2015

Corona Heights Fault, San Francisco

At the end of the AGU Fall meeting, Callan visits the Corona Heights “mirror” fault, renowned for its gorgeous slickensides. Explore the site in photos in GigaPans.


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4 September 2015

Faults aren’t lines

A new post on GeoSpace, a sister blog here at the AGU Blogosphere, calls attention to a new study by Simon Lamb and colleagues on the plate-boundary fault running through New Zealand’s South Island, the Alpine Fault. The post is apparently taken and lightly adapted from a press release on the Victoria University of Wellington website, where it was authored by a “communications adviser.” I call your attention to it …


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6 December 2011

AGU 2011, day 2

In the interest of conveying a sense of the sort of stuff that goes on a large science conference like the AGU Fall Meeting, I’ll resume my narrative where I left off with yesterday’s description. I began by swinging by the press room where I grabbed a complimentary breakfast, then headed down to the “early earth” session where I got a review on zircons of Hadean and Archean age. Then …


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5 December 2011

AGU 2011, day 1

I got to San Francisco on Saturday afternoon, flying in on the same flight from DC as Rob Simmon and Maria-José Viñas. MJ and I took the BART downtown, and then met up with Jess Ball for Thai dinner and a yummy dessert of banana wrapped in roti with Nutella and coconut ice cream. Then, jet lag informing me it was time for rest, I went to bed. I had …


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