90 AUGITIC ROCKS. beds of basalt occur, interstratified with an equal number of Tertiary limestones; 1 and in the Pic de Teyde, TenerifFe, this rock alternates with obsidian and trachyte. In Canada, the more modern basalts constitute the mountains of Rougemont, Montanville, and Mount Royal. 2 In the Canary Islands, the ex hibition of basaltic and other volcanic products is exceedingly grand. Over marine lavas and tuffs, trachytic and basaltic products of subaerial volcanic origin, between 4000 and 5000 feet in thickness, have been piled, and in the central parts of the Grand Canary reach a height of 6000 feet above the level of the sea. 3 In India an immense tract is overspread by sheets of basalt, stretching from Bombay to Umurkuntuk, and from Belgaum to Goona. These sheets are asso ciated with freshwater strata and volcanic ashes, and are referred by Mr. Blanford to the Upper Cretaceous epoch.' 1 Art Illustrations. Basalt has been fancifully used in sculpture in ancient times by Egyptians, Greeks, and Romans, and in the galleries of Italy we occa sionally meet with illustrations of its application to statuary purposes. Thus in the Museum at Naples, 1 Jameson, System of Mineralogy, iii. 188. 2 Logan, Geol. of Canada. 3 Lyell, Student’s Elements of Geology, p. 522. 4 Mem. Geol. Survey, India, vol. vi. part 2. See also Malcolmson, Geol. Trans. 2 ser. vol. v., with map.