Permo-Triassicadj.n.
/ˌpəːməʊtrʌɪˈasɪk/, U.S. /ˌpərmoʊtraɪˈæsɪk/ Geology.
A. adj.
Of or relating to the Permian and Triassic systems or periods, or the boundary between them.
ΘΚΠ
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Permo-Triassic1876
the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > Permo-Triassic
Permo-Triassic1876
1876 Nature 19 Oct. 557/2 The classification of the Silurian, Devonian, and Permo-Triassic (Poikilitic) formations.
1926 Proc. Geologists' Assoc. 37 11 By the close of Permo-Triassic times the climate would have altered considerably from that at the commencement of the period.
1956 W. Edwards in D. L. Linton Sheffield i. 3 They are being exploited, for oil as well as for coal, below the ‘cover’ of Permo-Triassic rocks.
1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles xii. 272 The drawing of the Permo-Triassic boundary is fraught with difficulties.
1989 S. J. Gould Wonderful Life (1991) 306 David M. Raup..has estimated species loss in the Permo-Triassic extinction, the granddaddy of all, at 96 percent.
2000 National Geographic Sept. 105/2 Visscher and his colleagues have found elevated levels of fungal remains in Permo-Triassic rocks from all over the world.
B. n.
The Permian and Triassic periods or systems considered jointly.
ΚΠ
1903 H. Le R. Fairchild Le Conte's Elements Geol. (ed. 5) iii. v. 619 Some indications of glaciation have been reported from other horizons than the Permo-Triassic.
1937 Geogr. Jrnl. 90 498 The visible outcrops of the Old Red Sandstone at Nairn and the Permo-Triasic at Burghead.
2001 Q. Rev. Biol. 76 482 [The book] takes readers to some of the most important but imperfectly known of these regions, the Permo-Triassic of western Russia..and to the Cretaceous of Mongolia.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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adj.n.1876