Excerpt from Geological Travels, Vol. 2 of 3: Travels in England, Translated From the French Manuscript In speaking 'he says of the natural epochas marked out by the phenomena of the mineral kingdom, we have supposed a greater simplicity, and separation of effects from one another, thah probably takes place in nature. We have, for instance, abstracted, in Speaking of the waste and degradation of the land, from that elevation which may have been carried on at the same time. T his appeared necessary to be done, in order to simplitsr as much as possible the view that was to be given of the Whole; but there can be no doubt, that, while the land has been gradually worn down by the Operations on its surface, it has been raised up by the expansive forces acting from below. There is even reason to think, that the elevatioiz has not been uniform, but has been subject to a kind of oscillation, insom'uch, that the continent's have both ascended and descended, or have had their level alternately raised and depressed, indefi pendentlyeof all action at the surface, and this within a period comparatively of no great extent. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Four Centuries of Geological Travel: The Search for Knowledge on Foot, Bicycle, Sledge and Camel focuses on the complexities of geological exploration and will be of particular interest to earth scientists, historians of science and to the general reader interested in science.

Morocco is one of the most fascinating lands in the world from the point of view of its geological structure and evolution. Our knowledge on the geology of the country has been greatly improved during the last decades, based on numerous seismic profiles and boreholes, seismological analysis of focal mechanisms, seismic tomography, gravimetric/geodetic modelling and, on the other hand, based on a big National Program of Geological Mapping including modern geochemical analyses (trace elements) and reliable isotopic datings (39Ar-40Ar, U-Pb zircon, Sm-Nd, etc). Moreover, a number of academic studies have been performed in relation with the increasing number of Moroccan universities. Accordingly, there was an utmost urgency to undertake a new treatise of Moroccan geology which could substitute for the classical Eléments de géologie marocaine, published in 1976 by A. Michard in the Notes et Mémoires du Service géologique du Maroc (re-edited twice since 1976, with more than 6000 copies sold, and... translated in Japanese for engineers!). A new treatise has been prepared between April 2006 and July 2007 under the coordination of A. Michard, assisted by O. Saddiqi, and A. Chalouan, by a wide panel of authors from Morocco, France or Belgium among the best connoisseurs of the country. In order to emphasize the general interest of the book, we finally retain the following title: Continental Evolution: The Geology of Morocco. Structure, Stratigraphy, and Tectonics of the Africa-Atlantic-Mediterranean Triple junction. The editing and production of this book was supported by the following organisations: The Geological Society of France (SGF) The National Office of Hydrocarbons and Mines of Morocco (ONHYM) The International Lithosphere Program (ILP)

"Publications of the Academy of Natural Sciences of Philadelphia": v. 53, 1901, p. 788-794.