Hi: Actually, there's even some skepticism about whether or not the "26 million year periodicity" is even real. It's certainly not clockwork. Scientific American has some interesting stuff about this at <http://www.sciam.com/askexpert_topic.cfm?topicID=22>. Scroll down the page about 2/3 of the way and look for the FAQ question about it. There are a couple of other questions there that some listees might find of interest, too.
Dave Hostetter Curator of the Planetarium Lafayette (LA) Natural History Museum and Planetarium > Hi Al, Tracy, Edward and others interested in the mass extinction > periodicity > problem... > ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
