1. The Ediacaran Period: A New Addition to the Geologic Time Scale Knoll, Andrew H.; Walter, Malcolm R.; Narbonne, Guy M.; Christie-Blick, Nicholas 2006 Articles GeologyHistory
2. A New Period for the Geologic Time Scale Knoll, Andrew H.; Walter, Malcolm R.; Narbonne, Guy M.; Christie-Blick, Nicholas 2004 Articles GeologyHistoryPaleontology
3. Three "First Places" for Ediacaran Period Knoll, Andrew H.; Walter, Malcolm R.; Narbonne, Guy M.; Christie-Blick, Nicholas 2004 Articles GeologyPaleontologyHistory