Authors: Karlstrom, KE Bowring, SA Dehler, CM Knoll, AH Porter, SM Des Marais, DJ Weil, AB Sharp, ZD Geissman, JW Elrick, MB Timmons, JM Crossey, LJ Davidek, KL

Citation: Ke. Karlstrom et al., Chuar Group of the Grand Canyon: Record of breakup of Rodinia, associated change in the global carbon cycle, and ecosystem expansion by 740 Ma, GEOLOGY, 28(7), 2000, pp. 619-622

Authors: Landing, E Bowring, SA Davidek, KL Rushton, AWA Fortey, RA Wimbledon, WAP

Citation: E. Landing et al., Cambrian-Ordovician boundary age and duration of the lowest Ordovician Tremadoc Series based on U-Pb zircon dates from Avalonian Wales, GEOL MAG, 137(5), 2000, pp. 485-494