Glaciation of the Puget Sound Region

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...Sound Glacier crossed the Des Chutes River valley where it emerged from the Huckleberry Mountains. The upper part of the Des Chutes Valley was protected by the Huckleberry Mountains against invasion of ice from Mount Rainier, and it was dammed by Puget Sound ice at its debouchure on the plain. This gave rise to a glacial lake. The pebbly clay deposited in this lake probably is responsible for the flat on which is the group of small farms and the Bald Hill School, a mile or two above the moraine crossing. The lake deposits and the moraine have been responsible for the superposition of the river on a rock spur of its pre-Vashon valley, and the consequent formation of the Des Chutes Falls, a beautiful double cataract with a picturesque canyon below it. (Plate X, Fig. An interesting problem is afforded by a comparison between the Nisqually and Des Chutes rivers where they enter the Puget Sound drift plain. Both were diverted after the glaciation, and forced to cut through rock for a short distance. Both possess deep post-glacial canyons, but the Des Chutes has a cataract at the head of its canyon while the grade of the Nisqually rises gradually through the canyon until it is at the level of the pre-Vashon valley. The rock is a fairly uniform dense lava in the Nisqually canyon, and a volcanic agglomerate in the Des Chutes canyon. Both are cut by dikes of more resistant rock which project on the canyon slopes. The Des Chutes carries over its fall debris secured by the erosion of the rock in the upper part of its valley while the Nisqually carries outwash gravel from the present Nisqually Glacier on Mount Rainier. The reason why one stream possesses a fall in its postglacial gorge while the other does not may be found in this difference of amount of debris carried...

Science & Math

J Harlen Bretz

Mathematics

RareBooksClub.com

Excerpt from The Channeled ScablandThe glacial waterways are river channels, largely made over from preexisting river valleys. (see pl. Evidence for a system of capacious preglacial river valleys is widespread and unescapable. Extending far up on the slopes of these valleys are strongly expressed channel features. In many places the glacial water crossed divides of the earlier drainage pattern, cutting canyon channels where no valleys had existed. Large portions of the scabland channel system, if not all of it, were certainly contemporaneous in origin. These relations demand a volume of glacial water surpassing anything ever previously asked for in geologic interpretation. The time element in the ﬂood hypothesis clearly can not extend through more than the briefest part of the erosion cycle now in progress and is appar ently to be reckoned as a very brief part of one Pleistocene stage. The recency of the ﬂood is attested by the freshness of the land forms it left - as fresh high on the channel valley $10pes as in their bottoms.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.

The Channeled Scabland (Classic Reprint)

Earth Sciences

Forgotten Books

See the best price to sell, buy, or rent books by J Harlen Bretz. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Books by J Harlen Bretz