Reports

No abstract available.

No abstract available.

During the last few years prospecting in the Medicine Bow and Park ranges in northern Colorado and southern Wyoming has proved that copper-bearing minerals occur frequently and are very generally distributed over a wide region in this portion of the Rocky Mountains. This has gradually become known through the discovery of several more or less promising copper deposits and also through the exploita

The purpose of this paper is to throw, if possible, some further light on the relations which existed during the later stages of the Glacial epoch between the glaciers of southeastern Wisconsin, which have been so ably discussed by Dr. T.C. Chamberlin and other writers in various publications, and the glaciers of Illinois, which have received such exhaustive treatment by Mr. Frank Leverett in his

No abstract available.

The Bisbee quadrangle lies in Cochise County, in the southeastern part of Arizona, within what has been called in a previous paper the mountain region of the Territory. It is inclosed between meridians 109 ° 45' and 110 ° 00' and parallels 31° 30' and 31 ° 20', the latter being locally the Mexican boundary line. The area of the quadrangle is about 170 square miles, and includes the southeastern ha

No abstract available.

No abstract available.

No abstract available.

No abstract available.

In Professional Paper No. 14 there were collected the chemical analyses of igneous rocks published from 1884 to 1900, inclusive, arranged according to the quantitative system of classification recently proposed by Cross, Iddings, Pirsson, and Washington. In order to supplement this work it has appeared advisable to select the more reliable and complete of the earlier analyses collected by Justus R

No abstract available.