Yahoo香港字典 搜尋

登入
  1. 更多

搜尋結果

  1. Oxford American Dictionary

    Burgess Shale

    • IPA[ˈbərjis ˌSHāl]

    美式

    • ph.
      a bed of shale exposed in the Rocky Mountains in British Columbia, Canada. The bed, dated to the Cambrian period (about 530 million years ago), is rich in well-preserved fossils of early marine invertebrates, many of which represent evolutionary lineages unknown in later times.