You are browsing the archive for featured Archives - AGU Blogosphere.
1 August 2024
Presenting the Proposed Slate for AGU’s 2024 Elections
As chair of the AGU Leadership Development and Governance Committee, I am pleased to announce the proposed slate of candidates for the 2024 AGU Elections. In accordance with our bylaws, AGU elects new leaders every two years. This year’s slate showcases a diverse and exceptional group of leaders ready to guide AGU’s future and further our commitment to discovery and solutions in the Earth and space sciences. The proposed slate …
21 January 2024
Swan song
A few reflections on the AGU Blogosphere’s long, strong run, and a vision for Callan’s future online outreach.
1 December 2023
Friday fold: a Massanutten cross-section from a century ago
The Friday fold digs deep into the historical archives for a near-century old illustration of the geology of the Massanutten mountain system in Virginia’s Valley & Ridge geologic province.
3 November 2023
Friday fold: Neoproterozoic rhyolite (of the Konnarock Formation?)
The Friday fold returns!
Today we join the Virginia Geological Field Conference to look at primary volcanic flow banding in a Neoproterozoic rhyolite, and consider what it might have to tell us about the ancient Snowball Earth glaciations.
28 July 2023
Friday fold/fauxld duet from Glacier National Park
When is an apparent anticline not an fold? Find out on this week’s edition of the Friday Fold…
5 September 2022
Book report
Callan reviews five books, both fiction and non-. In this batch, we get Neal Stephenson’s latest techno-thriller, about geoengineering and its discontents, Barack Obama’s first memoir, a novel by Charles Dickens, a collection of short stories by Andy Weir (author of The Martian), and Bill Bryson’s sole foray into popular science writing.
30 December 2021
Footprints: In search of future fossils, by David Farrier
Callan reviews Scottish author David Farrier’s nonfiction exploration of humanity’s signatures on the geologic record.
11 August 2020
Strange creatures: book reviews about mysterious animals in the sea
Callan reviews two well-written books about of enigmatic creatures of the deep: eels and lobsters.
22 May 2020
Friday fold: Anticline in Glacier National Park
Some web research led to a serendipitous discovery and further exploration. Wherever you’re sheltering in place, you don’t have a view that’s this grand. Slip away for a few moments to the high country of Montana’s Glacier National Park, where an anticline may be seen in the towering cliffs…
27 March 2020
Friday fauxld: a false syncline in Titus Canyon
What day is it again? Hard to keep track in the days of raging coronavirus infections, but it is in fact Friday, which means that if you want a dose of the halcyon pre-COVID-19 days, you can enjoy this example of a false fold from Death Valley National Park’s Titus Canyon.
7 February 2020
Friday fold: Kings Canyon
The Friday fold shows disharmonic crumpling in marbles of the Boyden Cave Root Pendant in California’s Sierra Nevada. The GigaPan image displayed is part of the digital legacy of Ron Schott, who passed away a year and a half ago.
31 January 2020
Friday fold: tension gashes near Sunflower, Arizona
Reader John Christian shared these folds with me via email last week. They are quartz veins in slightly metamorphosed Precambrian igneous rocks found near Sunflower, AZ in the Mazatzal Mountains. The second photo is a close-up shot of the curviest, cleanest batch of folds from the first shot. These are beautiful examples of folds in similarly oriented quartz veins; we call them “en echelon” for the way you have a …
13 December 2019
Friday fold: blueschist & eclogite at Jenner, California
A pre-Fall Meeting field trip to the coast of northern California yields rare sights of garnet-bearing blueschist, plus eclogite, some pillow basalts, birds, waves, wind, and a lot of rain.
10 December 2019
‘Streetcar 2 Subduction’ is live!
This week marks the launch of a new digital revision of a field guide to the geology of San Francisco, “Streetcar 2 Subduction.” Learn more here!
