Here’s your Friday fold, straight from the canyon of the Jefferson River, near Cardwell, Montana. Perspective is to the south. East is on the left; west is on the right. Bigger version This is right next to the outcrops of LaHood Conglomerate that I mentioned earlier this week. My Rockies course co-instructor Pete Berquist and … Read more
The Friday fold takes us to some high-grade metamorphic rocks in the Piedmont of northern Virginia.
Callan shares some more images from last summer’s trip to Capadoccia, Turkey. Eroded turrets of ignimbrite served as dwellings for Byzantine-era Christians, who decorated them with distinctive art.
The 30th edition of the “Accretionary Wedge” blog carnival is hosted at Mountain Beltway. A delectable array of foods, mainly dessert, are displayed. The treats demonstrate a wide array of geologic processes. Eat, drink, and be geologic!
The Friday fold is a series of strata underwater near California’s famed “Mavericks” surf break.
Callan showcases his contribution to this month’s Accretionary Wedge blog carnival. The theme of the Wedge is “Bake Sale,” and Callan shows a cake he “discovered,” describing its geologic origin in detail. This would be tongue in cheek, except that his mouth is already full of dessert.
This week’s edition of the “Friday fold” takes us to Route 55 in West Virginia, to deformed Appalachian strata of the Valley and Ridge province. A few bonus structures are also shown — some ripple marks, slickensides, and pencil cleavage.
Norwegian structural geologist Haaken Fossen contributes two incredible images for this week’s Friday fold: a pavement of drastically-shortened banded iron formation from Minnesota, and a trio of three white granitoid dikes, buckled within a gneiss from the Jotun Nappe, in the Norwegian Caledonides. Gorgeous images of gorgeous folds, with links to the rest of Fossen’s collection.
A diagram on “how science works” betrays an “experimentalist” bias. This sets Callan off on a rumination on the much-maligned validity of historical science, and that leads to a discussion of the Big Experiment, which is humanity’s influence on the Earth system.
A mystery rock is presented. Can you puzzle out what this beautiful thing is, and how it formed?