Dyasn.

/ˈdʌɪas/

Etymology: < Greek δυάς: see dyad n. After Trias.

Geology.

A name for the Permian system.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > Permian

Permian1847

Dyas1876

Permic1899

1876 D. Page Adv. Text-bk. Geol. (ed. 6) xv. 273 The lower red sandstones and magnesian limestones—the Dyas or double group of German geologists.

1887 Athenæum 29 Jan. 163/2 In the place of Murchison's term ‘Permian’..he follows continental geologists in using Marcou's rather awkward word ‘Dyas’.

Derivatives

Dyassic adj.

/daɪˈæsɪk/ Permian.

ΘΚΠ

the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Permian

poikilitic1832

Permian1841

Dyassic1878

Permic1914

1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 105 Rocks belonging unmistakably to the Rothliegende or Dyassic age.

This entry has not yet been fully updated (first published 1897; most recently modified version published online September 2018).

单词	dyas
释义	Dyasn. /ˈdʌɪas/ Etymology: < Greek δυάς: see dyad n. After Trias. Geology. A name for the Permian system. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > Permian Permian1847 Dyas1876 Permic1899 1876 D. Page Adv. Text-bk. Geol. (ed. 6) xv. 273 The lower red sandstones and magnesian limestones—the Dyas or double group of German geologists. 1887 Athenæum 29 Jan. 163/2 In the place of Murchison's term ‘Permian’..he follows continental geologists in using Marcou's rather awkward word ‘Dyas’. Derivatives Dyassic adj. /daɪˈæsɪk/ Permian. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > primary or Palaeozoic > Permian poikilitic1832 Permian1841 Dyassic1878 Permic1914 1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 105 Rocks belonging unmistakably to the Rothliegende or Dyassic age. This entry has not yet been fully updated (first published 1897; most recently modified version published online September 2018). < n.1876
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