志留紀 [－－纪]

Jyutping zi3 lau4 gei2
Pinyin zhì liú jì

Definitions (CC-CEDICT)
  1. Silurian (geological period 440-417m years ago)
Definitions (Wiktionary)
  1. name
    the Silurian period (part of the Paleozoic era, spanning from 443.4 to 419.2 million years ago)