Hundreds of millions of years of change in the Cordilleran terranes of western North America
Boulder, Colorado, USA - The March GSA TODAY, the Geological Society of America's open-access science and news magazine, is now online at http://www.geosociety.org/gsatoday/archive/22/3/. This month's science article, by Todd LaMaskin of the University of North Carolina at Wilmington, presents uranium-lead dating analyses of detrital zircon grains in Paleozoic-Mesozoic basin sediments in the Cordillera of western North America.
LaMaskin's analysis shows a systematic variation in age distribution within the depositional age and setting of the host sediments. Four such ...




