Publisher's Synopsis
Excerpt from The Klondike Gold District, in the Yukon Valley, Canada: A Paper Read Before the Above Association
A few words as to the meaning of these terms may be useful in this connection We regard the Laurentian as the oldest rocks known - the foundation of the rocky crust of the earth. A lower and an upper division may be recognised in various parts of their distribution, which is very wide, comprising most of the north - eastern portion of North America, including Greenland. The rocks of the lower division are composed of only a few of the commonest minerals, quartz, and orthoclase being the principal ones, together with a smaller proportion of hornblende and a little biotite or phlogopite. Scattered small crystals of magnetite may be occasionally detected.
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