Keywords: Geologie der Stephen Formation.jpg en Geology of Burgess Shale with position of Walcott's Phyllopod bed Ref Miall A D 2008 The Paleozoic Western Craton Margin The Sedimentary Basins of the United States and Canada Elsevier pp 191-194 ISBN 0444504257 http //books google co uk/books hl en lr id lURlvzrRcCgC oi fnd pg PA181 dq 22burgess+shale 22+cathedral ots bk4EP1QJW7 sig V13gnjzqjxo29O1Pr1xkDS4vPCQ PPA191 M1 Retrieved 2009-04-26 http //en wikipedia org/wiki/File Burgess_Shale_geology_01 png uselang en User Philcha changed byUser Jbo166 Check categories 2009 October 30 de wikipedia Burgess-Schiefer 1 Burgess Shale |