1. A high latitude Upper Triassic flora from the Heiberg Formation, Sverdrup Basin, Arctic Archipelago;Ash;Geol. Surv. Can. Bull.,1991
2. Palynological zonation of the Late Jurassic and Early Cretaceous sediments of the Yarragadee Formation, central Perth Basin, Western Australia;Backhouse;Rep. Geol. Surv. West. Aust.,1978
3. Lower Cretaceous floras of Western Canada;Bell;Geol. Surv. Can. Mem.,1956
4. Interpretation of the Morrison Formation as a time-transgressive unit;Bowman,1986
5. Fruiting organs from the Morrison Formation of Utah, U.S.A.;Chandler,1966