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You are browsing the archive for 2012 March.

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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17 March 2012

Lageson goes up

One of Callan’s former advisers, Dave Lageson of Montana State University, heads to the summit of the world’s tallest mountain with his graduate student, the accomplished mountaineer Conrad Anker.

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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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15 March 2012

An edgy outcrop

That’s a big pile of alluvial fan deposits (and colluvial debris?) on the eastern edge of the highway leading from Cape Town down to Rooiels. It’s not lithified, but it does seem to be at least partially cemented (perhaps by caliche?), because the outcrop face is essentially vertical, and there seems to be very little sediment that’s falling down onto the road (at least on the day I visited). It’s …

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14 March 2012

Reef Madness, by David Dobbs

Callan reviews a book about the historical battle over the meaning of coral reefs. Protagonists include Charles Darwin and the son of Louis Agassiz. The book’s author, David Dobbs, answers some questions for Callan and readers.

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13 March 2012

Elevation 10,000 feet

White Mountains, California. Photo (and animated GIF) by Filip Goc. A little silliness for your Tuesday morning.

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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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9 March 2012

Filip’s Friday Fold

While on Callan’s field course in eastern California, student Filip finds a lovely fold sample.

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8 March 2012

Poleta plume paradise

On Monday, my field course students and I tried to find the Poleta folds, but I had failed to figure out in advance the best access point. Oops. That’s the way the cookie crumbles, when you’ve got big plans but not enough time to enact them with appropriate pre-planning. We had some happy exploration of the hills south of Route 168, though, and found tons of blocks of the Cambrian-aged …

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7 March 2012

Scenes from last Sunday: Bishop Tuff and Volcanic Tableland, CA

Sunday was our first full day in the field. Here’s a few looks at my NOVA students doing geology out in eastern California. We spent the day on, and next to, the Volcanic Tableland north of Bishop, a massive stack of ash fall and ignimbrite deposits erupted from Long Valley Caldera 760,000 years ago: the Bishop Tuff. Climbing the southern edge of the Volcanic Tableland from the erosional valley of …

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