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17 May 2019
This week, for Friday folds, I offer up some random folds that have passed my perceptual transom this week. First up: In the new Netflix series Our Planet, in episode 7 (Fresh Water), an anticline/syncline pair makes a brief appearance as David Attenborough discusses glaciers as a reservoir for fresh water. Here is a screenshot: I’m not sure where this is in the world: Greenland? Antarctica? Let me know in …
23 November 2016
Yesterday, I mentioned climate change visualizer extraordinaire Zack Labe. As delineated then, he’s a PhD student at U.C. – Irvine in the Earth Systems Science department. He’s producing some really excellent #dataviz on climate change. Today, I’d like to share a short exchange I had with Zack about his work. 1) Please give Mountain Beltway readers a sense of your background, leading up to what you’re working on …
22 November 2016
The amount of sea ice on planet Earth is much, much lower than ever recorded at this time of year. Will this anomaly turn out to be a relatively minor “weather” event? Or is this what a sea ice tipping point looks like?
26 May 2016
Glaciers can cause thrust faults! Explore an example from a trench south of Chicago.
19 June 2015
Howard Allen, a retired petroleum geologist from Calgary, and longtime reader of this blog, contributed this week’s Friday fold: Subglacial drag fold (Pleistocene) in Upper Cretaceous Horseshoe Canyon Fm. bedrock (sandstone, shale). The locality is SE of Drumheller, AB at UTM 12U 394247 5692469 (WGS84). Did you hear that right? Yes, you did: This is Cretaceous aged sedimentary rock, folded by a Pleistocene glacier, tens of millions of years after …
27 February 2014
Over the past 2 weeks, I’ve been sharing some images here from a field trip the previous week to Corridor H in eastern West Virginia. I love this road, but I guess it’s fair for me to point out that sometimes in the middle of winter, this is what the outcrops look like: …Yep. Next road-cut, please.
3 February 2014
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 …
29 January 2014
It’s another cold morning in the Fort Valley. To celebrate winter’s continuing grip, please enjoy these images from last Friday morning, on my way to work… Frost on plants: Frost on barbed wire: Finally, here’s a time-lapse video (5 times actual speed) of the first 6 miles of my commute (walking, then driving): [vimeo=http://vimeo.com/85285064]
7 January 2014
Some ice seen this morning, the coldest we’ve yet experienced at our home in the Fort Valley… 4° F when we got up this morning, with windchill around -15° F. Frost nucleated on a “petal” from a tulip tree (Liriodendron tulipifera): Frost on grass (note the different habit of the ice crystals here): Frost on some netting: Frost on some plant stems near a little creek on our land: Ice …