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The other method “involves studying a volcano to death,” mapping the volume of each lava flow, he said. Such a study can take five years, if not longer, under good conditions—and, well, Ferguson is a postdoc. His financing runs on a year-to-year basis. On a less pragmatic note, glaciers are naturally erosive. How much lava did they scour away into the Pacific? Hard to say.

Kayaking through Patagonia’s fjords,Wholesale Peruvian Virgin Hair Online (http://www.charmfemale.com/), Ferguson chose a third option: the cinder cones. Stratovolcanoes are often flanked by small hills,Wholesale Lace Wigs (http://www.charmfemale.com/), miniature volcanoes,Wholesale Brazilian Straight Virgin Hair (http://www.charmfemale.com/), really, formed by short bursts of magma, often active for only a decade or so. The cones tend to be made of primitive magma, frozen mineral slurry that closely resembles what’s found down in the mantle. It’s heavy, uniform—Ferguson hoisted a slab in his office—and boring. He counts on that dullness to make it easier to date.

Cones aren’t easy to find. Take two identical hills, cover them in dense forest, and it’s nearly impossible for the layperson to tell which one was created through eruption. Ferguson won’t pretend he has found them all. “Probably there are loads more that we just didn’t spot,” he said.

There were moments of serendipity. The region’s main road was being paved, plowing a series of road cuts through the rock. Geologists love road cuts. “A proscenium arch that leads their imaginations into the earth,” John McPhee wrote. Ferguson and Watt clung to the roadside, chipping out bits of basaltic scoria. “It’s not the most pleasant place to do fieldwork—but the exposure, you can’t beat it,” Ferguson said. In a few years, those sites will be overgrown, essentially lost to science.

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