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1 February 2013

Friday fold: Mosaic Canyon Monster

While out in Death Valley with my Field Studies students last March, we encountered an extraordinary fold in Mosaic Canyon. Check this thing out: The rock is the Noonday Dolostone (“Noonday Dolomite” in mineralogically biased argot). It may be hard to make out what’s what there… So let me assist with a little annotation, tracing out the bedding: Wild, eh? That’s an extraordinarily messed up rock. “Goopey” is the adjective …

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30 January 2013

Sand avalanche animated GIF

Some of the dynamics of small-scale mass wasting in granular materials are captured in this animated GIF from sand dunes in Death Valley.

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17 January 2013

Cross-bedding in Owens River sediments

Today, we take a look at an outcrop of young, basically unlithified sediments east of Bishop, California, on the way out Poleta Road, toward the White Mountain Research Station’s Owens Valley Lab, where you can get a nice view of the Coyote Warp Relay Ramp. These photos were taken just west of the bridge over the Owens River. The rapidly-eroding outcrop there is on a small bluff a few meters …

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15 January 2013

Ripples in the sand

All seen last March in Death Valley, at Mesquite Dunes…. within ten minutes of one another.

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28 March 2012

Hanksite and other wonders of Searles Lake

Callan’s field studies class journeys to Searles Lake, California, a playa rich in evaporite minerals both prosaic and exotic.

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21 March 2012

More folds from the White Mountains

I know we spent time last Friday on some nice folds in the Poleta (?) Formation in the White Mountains of California, but here are a few more that I saw on my way up to the Ancient Bristlecone Pine Forest… Some elliptical objects caught my eye: Traced out along the plane of bedding, these turned out to be boudins of a more competent layer, which was tightly folded higher …

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20 March 2012

Eruption column in Owens Valley :)

I’ve been showing a lot of photos lately from my field course’s trip up into the White Mountains. While we were driving up the road from Westgard Pass to the Ancient Bristlecone Pine Forest, we saw something interesting going on in the southern Owens Valley. Take a look at this view to the southwest, from the overlook: See it, way there in the distance, but between the photographer’s vantage point …

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19 March 2012

Overturned bedding in Poleta (?) Formation, White Mountains, California

After a roadside explanation just an hour and a half earlier on how the relationship between bedding and cleavage can reveal whether bedding is likely right-side-up or up-side-down, my students and I were walking up the road to the Ancient Bristlecone Pine Forest in the White Mountains of California, and I saw this outcrop that illustrated the concept perfectly: The blue thing is a pen, to provide a sense of …

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16 March 2012

Friday folds: Serendipity in the White Mountains

Callan and his field studies students encounter a lesson in the White Mountains of eastern California that combines bedding, cleavage, folding, and even fossil archaeocyathids!

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12 March 2012

Views of the Deep Springs Basin

A few shots from a week ago today, when my students and I were exploring the White Mountains of eastern California, just west of the Deep Springs Basin…

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