第六章-早古生代地史.pdf

Early Palaeozoic Era Early Palaeozoic Era CONTENTS CONTENTS Silurian,S 435-410Ma Murchison, 1835, Ordovician,O 500-435Ma Lapworth, 1879 Cambrian, 540-500Ma Sedgwick, 1835Cambria 130Ma ‾ small shell- small shell- bearing bearing fauna fauna