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19 July 2019

Friday fold: Banded iron formation from the University of Wisconsin geology museum

A final Friday fold from Madison, Wisconsin: this one a slab of cut and polished banded iron formation from Australia: What exquisitely beautiful rock! Happy Friday!


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5 July 2019

Friday fold: the University of Wisconsin geology museum stained glass window

Today’s Friday fold is rendered in stained glass, along with a bunch of other geological details, as seen at the entrance to the geology museum at the University of Wisconsin (site of our previous Friday fold): Beautiful work!


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21 June 2019

Friday fold: The University of Wisconsin rock garden

I’m at a workshop in Madison, Wisconsin, this week. I took the lunch hour today and walked over to the geology department to check out their rock garden and geology museum. I was pleased to find a Friday fold in the rock garden: a limestone with cherty nodules/layering that has been folded…. Bonus: some nice bookshelfing/boudinage of the chert: …And here’s another boulder of the same lovely stuff. And here …


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21 October 2011

Friday fold: Van Hise Rock

Wednesday, Alton Dooley put up a post about his visit to Van Hise Rock in Wisconsin. He included this photo of the famous rock with its upright (pretty much vertical) layers: Go read his description of the lithology for more detail, but essentially what you see here is an Oreo-like sandwich: pink quartzite (meta-sandstone) on each side of a central layer of gray phyllite (meta-mudstone). The phyllite displays a strong …


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