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You are browsing the archive for September 2020 - Mountain Beltway.

18 September 2020

Friday fan: Death Valley, California

Working up some new images for my free, online Historical Geology textbook, I annotated a photograph I took in March of this alluvial fan in southern Death Valley. The development of desert varnish on older parts of the fan shows their age visually in a quick and easy way of determining fan deposit sequence: I’ve been making a lot of these animated annotations as a way of conserving space in …

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11 September 2020

Friday fold: Boscastle, Cornwall

A hilly region of Cornwall, U.K. features beautiful folding, and a fuzzy field assistant!

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4 September 2020

Friday fold: Home décor

Busy weeks lately; apologies for the minimal bloggery, friends. For this week’s Friday fold, I offer you a view of some of the outdoor decorations at our new house: In the lower basket there is a cut and polished block of Castile Formation rock gypsum + limestone, showing varves that have been folded, apparently by hydration/dehydration volume changes of the gypsum/anyhdrite laminae: This is from the State Line outcrop on …

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