Excerpt from The Journal of Geology, Vol. 3: July August, 1895 In the course of a much closer examination of these hills than had previously been possible, it was in effect found, that they show a series of terraces, running up from about 3200 feet to a maximum height of 5300 feet above sea level, and that drift from the Laurentian Plateau, on the east and the Rocky Mountains on the west occurs, as well-rolled shingle, up to the highest level of these terraces and no further. The elevation is nearly three times that of the Laurentian Plateau, and the circumstances show that the Laurentian and Rocky Mountain stones reached these high levels at the same time. A comparison of the highest levels of the drift in several places in southwestern Alberta, indicates the existence of a tract of greatest depression and of subsequent maximum elevation in a part of that district, and probably that of a series of nearly parallel isobases of decreasing amount to the northeastward of this tract, trending east-southeast by west-northwest, but turning to a northwesterly direction (corresponding with that of the mountains) further to the northward. Whether the upper limits of glacial deposits be accepted as the shore-lines of an extended body of water, as marking the sur face level of a mer a'e glace or as the margin of a glacier-dammed lake, enormous changes of level in the region must equally be admitted. A search for eastern erratics upon higher parts of the foot hills, in certain localities somewhat extends the spread of this drift to the westward, beyond the line drawn for it by me upon previous maps. These erratics in fact become quite sporadic in their distribution on approaching the mountains. 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.