The American Geologist, Vol. 2 (Classic Reprint)
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| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The American Geologist, Vol. 2 In this part of the continent there are several series of rocks which may properly be referred to the Cambrian system. The following article refers to two of these and describes some of the most noticeable features of their faunas. A. Etchiminian Series. This the oldest of these series is not known to have any trilobites; nor have animals of this order been found in the rocks which in Wales and Norway are supposed to be of equivalent age. Throughout its whole thickness organic remains are scanty, or are so small, or obscure, as not to be readily observed. In traversing the outcrops of its measures one is at times arrested by the abundance of worm burrows, casts and tracks, indicating the existence of abundant life of a certain kind. These tracks and casts are found in the very oldest beds which are capable of preserving the imprint of organic remains; they occur in sandstones and shales immediately above the conglomerate at the base of the series. This conglomerate, about 60 feet thick, rests upon amygdaloidal greenstones, which in the report of the geological survey of Canada are referred to the Huronian system. 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.
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