| 释义 |
Dyas Geol.|ˈdaɪæs|
[a. Gr. δυάς: see dyad. After Trias.]
A name for the Permian system.
1876Page Adv. Text-bk. Geol. xv. 273 The lower red sandstones and magnesian limestones—the Dyas or double group of German geologists. 1887Athenæum 29 Jan. 163/2 In the place of Murchison's term ‘Permian’..he follows continental geologists in using Marcou's rather awkward word ‘Dyas’.
Hence Dyassic |daɪˈæsɪk|, a., Permian.
1878Lawrence tr. Cotta's Rocks Class. 105 Rocks belonging unmistakably to the Rothliegende or Dyassic age. |