What is the meaning of Dyas?

(n.) A name applied in Germany to the Permian formation, there consisting of two principal groups.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). Dyas. Retrieved September 21, 2026, from http://smartdefine.org/dyas/definitions/2001150
ChicagoWebster's. 2011. "Dyas" http://smartdefine.org/dyas/definitions/2001150 (accessed September 21, 2026).
HarvardWebster's 2011, Dyas, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/dyas/definitions/2001150>.
MLAWebster's. "Dyas" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/dyas/definitions/2001150>