Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian system Babeock, Loren E. ; Peng, Shanchi ; Geyef, Gerd ; Shergold, John H. Abstract Publication: Geosciences Journal Pub Date: June 2005 DOI: 10.1007/BF02910572 Bibcode: 2005GescJ...9..101B