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9 March 2018

Friday fold: Raplee Monocline

It’s Friday! Let’s head to Utah for a guest Friday fold photo – a river rat’s view of the Raplee Monocline!!


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6 March 2012

Plane views

Some views from the airplane, over southern Wyoming (first two photos) and north-central Nevada (last four), last Saturday morning… A canyon: …and zooming in to the middle area of the previous photo: Strata upwarped into a structural dome (that has been “planed off” to be topographically horizontal, revealing a bull’s-eye-shaped outcrop pattern, then differentially weathered and highlighted by snow: Salt flat (playa lake + playa) in the Basin & Range …


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22 September 2011

More moki marbles

More moki marbles: little concretions in sandstone, kind of like the ones I showed you Tuesday from Illinois. But these ones are from the Navajo Sandstone, a late Triassic or early Jurassic erg deposit from the Colorado Plateau. These photos were taken in Zion National Park, near Springdale, Utah (real close to the cross-beds I featured a month ago). They are tougher than the sandstone in which they formed, and …


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