Tracy Frank¹, Christopher R Fielding², Katarina Savatic³, Allen P Tevyaw⁴, Stephen McLoughlin⁵, Vivi Vajda⁶, Christopher Mays⁵, Robert S Nicoll⁷, Malcolm Bocking⁸ and James L Crowley⁹, (1)University of Nebraska Lincoln, Lincoln, NE, United States, (2)University of Nebraska Lincoln, Earth & Atmospheric Sciences, Lincoln, NE, United States, (3)University of Nebraska-Lincoln, Lincoln, NE, United States, (4)University of Nebraska-Lincoln, Earth and Atmospheric Sciences, Lincoln, NE, United States, (5)Swedish Museum of Natural History, Stockholm, Sweden, (6)Swedish Museum of Natural History, Department of Palaeobiology, Stockholm, Sweden, (7)Retired, Canberra, Australia, (8)Bocking Associates, Sydney, Australia, (9)Boise State University, Boise, ID, United States