CHAPTER IV

THE ROCKS OF THE EARTH’S SURFACE SHELL

The processes by which rocks are formed—The marks of origin—The metamorphic rocks—Characteristic textures of the igneous rocks—The classification of rocks—Subdivisions of the sedimentary rocks—The different deposits of ocean, lake, and river—Special marks of littoral deposits—The order of deposition during a transgression of the sea—The basins of deposition of earlier ages—The deposits of the deep sea—Reading references 30