Dating - in Geology at least- relies on an often stated presupposition: That whatever happended in the past happended slowly and at a constant rate. Well, things for dating are about to change as geologists take on board "catastrophic" events. One such "catastrophic" event is the Mount St Helens explosion which occurerd in the 80's. Geologists have now been able to carefully document the changes that occured with the eruption of Mount St Helens. What they found will fundamentally change the way we look at geological dating. In this book on the events following the eruption of Mount St Helens, the authors carefully show how a catastrophic event can cause sedimentation and erosion previously only assumed as possible over very long time periods. This is a must read for those interested in geological dating.