a. Geol. [f. TRIAS + -IC.] Of or belonging to the Trias; Triassic system = TRIAS 2.
1841. Sir P. G. Egerton, in Proc. Geol. Soc. Lond. (1842), III. (title of paper), A Notice on the Occurrence of Triassic Fishes in British Strata.
1868. Lyell, Princ. Geol. (ed. 10), II. III. xlix. 592. A long narrow island … composed partly of granite and partly of triassic sandstone.
1889. Science-Gossip, XXV. 122/2. The Triassic and Permian formations show a time of ‘great physical disturbance,… volcanic eruptions discharging vast beds … of lava and layers of volcanic ash.’
