Hi, Joe. I understand that the process that formed the San Rafael Reef/Swell is tectonic plate subduction, and I believe that Capital Reef was formed the same way, if that's the correct term. (Are smaller geologic plates still "tectonic" plates? Who are our resident geologists?) Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Wednesday, January 28, 2009 12:03 PM To: Utah Astronomy Subject: [Utah-astronomy] San Rafael Swell The San Rafael Reef that edges much of the Swell has miles of rock formations standing nearly on end. I was told more than 20 years ago by a well-known geologist that the Swell was part of the widespread geological process that formed the Rocky Mountain. But does anyone think the San Rafael Reef could be the rim of an impact crater? Just wondering -- Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com No virus found in this incoming message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.15/1921 - Release Date: 1/28/2009 6:37 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.15/1921 - Release Date: 1/28/2009 6:37 AM