Plants first began colonizing the land during the  Ordovician period, about 470 million years ago.

大约 4.7 亿年前的奥陶纪时期，植物首先开始在这片土地上定居。

The Ordovician period also saw the advent of more active suspension feeders, like the giant, filter-feeding anomalocarid Aegirocassis.

奥陶纪时期还出现了更活跃的悬浮式捕食者，例如巨大的滤食性奇虾 Aegirocassis。