Correlation Papers; Archean and Algonkian

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... THE QUART'/ITE MOUNTAINS. In the Quartzite mountains the Algonkian is represented by a series of quartzites, interstratified with slates several thousand feet thick. The series had suffered powertul dynamic action, being turned on end and deeply truncated before Carboniferous time. The relations of this series to the Archean are not certainly known, but all the evidence points toward the conclusion that the Algonkian is of later age and that between it and the Archean is a great unconformity. GRAND CANYON OF THE COLORADO. The Algonkian in the Grand canyon region is represented by three series, the Chuar, the Grand canyon, and the Vishnn. The Chuar series consists of shales and limestones, over 5,000 feet thick. It contains a fauna of a pre-Cambrian type, inclnding at least five distinct forms. The Grand canyon series is of sandstones, with basic lava flows in its upper part, and is nearly 7,000 feet thick. The Vishnu series consists of bedded quartzites and schists, cut by intrusive granite, and is known to be at least 1,000 feet thick, but how much thicker has not been determined, as it has not been measured to its base. The Chuar rests upon the Grand canyon and between the two is a minor unconformity. The Grand canyon rests upon the Vishnu and between the two is another unconformity. The Chuar and Grand canyon sediments are wholly unmetamorphosed, while the Vishnu sediments are indurated quartzites and semicrystalline schists. Between these series as a whole and the underlying Archean complex is a very great unconformity. Between the Chuar and the Tonto sandstone (Upper Cambrian) there is another unconformity sufficient to have caused the cutting across of at least 10,000 feet of the flexed beds of the Grand canyon and Chuar series. In...