June 22, 2012
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One of the world’s great craters
When I visited the Upheaval Dome in 1987, I was sure it was an impact crater. But roadside displays and printed literature from Canyonlands National Park said otherwise. Clearly, they reported, this was collapsed salt dome. Since then German researchers have found evidence, through shocked quartz, of an impact. That now appears to be the prevailing theory. The… Continue reading
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Bridges covered
My sister and I received a durable lesson in generosity in the summer of 1963, in the heart of Iowa. That was where our family’s 1957 Ford Country Sedan station wagon, towing our Nimrod pop-up camper trailer, broke down. It was on a Sunday morning in late June, heading south from Des Moines on I-35… Continue reading