CHAPTER V

CONTORTIONS OF THE STRATA WITHIN THE ZONE OF FLOW

The zones of fracture and flow—Experiments which illustrate the fracture and flow of solid bodies—The arches and troughs of the folded strata—The elements of folds—The shapes of rock folds—The overthrust fold—Restoration of mutilated folds—The geological map and section—Measurement of the thickness of formations—The detection of plunging folds—The meaning of an unconformity—Reading references 40