Lower Ordovician

芙蓉世（Furongian）是寒武紀第四個也是最後一個世，始於497百萬年前，終於485.4百萬年前。芙蓉世位於寒武紀苗嶺世以及早奧陶世（英语：Lower Ordovician）特馬豆剋期之間，又再被細分為三個期間：排碧期、江山期以及還未命名的寒武紀第十期。 芙蓉世以前曾被稱為寒武紀「第四世」，以替代「上寒武世」（Upper

known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south-western Hubei, central China. Palaeontology

appropriate title for the central system of the Lower Palaeozoics. It should be called the Ordovician System, after this old British tribe." 王光旭. “奥陶纪”一词译名考

latest Ordovician (JANVIER 1996)  Sansom, Ivan J.; Smith, Moya M.; Smith, M. Paul. Scales of thelodont and shark-like fishes from the Ordovician of Colorado

alga from the Lower Ordovician of Wales (PDF). Palaeontology. 1998, 41: 1069–76. （原始内容 (PDF)存档于2012-03-09）.  Brooke, C.; Riding, R. Ordovician and Silurian