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16 March 2009
SP Flow and Sunset Crater
(This is day 3 of a week-long field trip to Arizona. Catch up with days 1 and 2!) Today was all about volcanoes. We started early, driving north out of Flagstaff and skirting around the huge San Francisco peaks, which are the remnants of a huge stratovolcano (think Mt. Fuki or Mt. Rainier). The volcano formed between about 1 and 0.4 million years ago. It is currently 12,633 feet high, …
7 March 2008
How old is the Grand Canyon? The speleologist knows…
I learned a new word in Science this week: Speleology: the study or exploration of caves. Think “spelunking.” The word was in an article by UNM geologists Polyak et al. on a new age estimate of the Grand Canyon. For many years now, geologists have estimated the formation time of the Canyon at around 6 million years. The new study puts the age at close to 20 million. This may …
