a. (sb.) Geol. [ad. F. Toarcien, f. L. Toarcium, F. Thouars, in western France.] Applied to a series of strata corresponding in position to the Upper Lias of England, which are extensively developed in Central and Southern France.
[1859. Page, Handbk. Geol. Terms, 49. Upper Lias, Toarcien of d’Orbigny.]
1885. Geikie, Geol., 802. In Normandy, the Toarcian stage is only about 20 feet thick.
1912. Return Brit. Museum, 172. Crinoids from the Oxfordian of Var … from the Toarcian of the Balearic Islands. Ibid., 182. Seven Crinoid stem-fragments from the Toarcian rocks of Cabrera, Balearic Is.
