Geology and ore deposits of the Philipsburg quadrangle, Montana

Professional Paper 78
By:  and 



The Philipsburg quadrangle is bounded by parallels 46° and 46° 30' and meridians 113° and 113° 30'. Its length from north to south is 34.5 miles, its average width east and west 23.8 miles, and its area 827.42 square miles. As shown on the index map (fig. 1), it is not far
from the western border of Montana and nearly midway between the northern and southern boundaries of the State. The nearest large town is Anaconda, the site of the great smelter of the Amalgamated Copper Co., which is on Warm Spring Creek, a mile or two beyond the eastern
boundary of the quadrangle.

Philipsburg lies about midway between the eastern and western limits of the Rocky Mountain system, if the term be used in the broad sense prevailing in the United States. In the general latitude of Montana the system as defined by American usage is bounded on the west by the Columbia River basalt plain and on the east by the Great Plains. The western limit is fairly definite, but on the east there is no very definite line between the plains and mountains; the mountains are fairly continuous west and north of the Philipsburg quadrangle, but to the east and southeast mountains alternate with broad stretches of semiarid lowland. The quadrangle therefore overlaps the line between two physiographic provinces, one characterized by isolated mountain groups, of which the Flint Creek Range is the most westerly, and the other by more continuous elevations, of which the Sapphire Mountains are an example.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Geology and ore deposits of the Philipsburg quadrangle, Montana
Series title Professional Paper
Series number 78
DOI 10.3133/pp78
Year Published 1913
Language English
Publisher Government Printing Office
Publisher location Washington, D.C.
Description Report: 271 p.; 2 Plates: 17.04 x 24.0 and 16.04 x 19.88 inches
Country United States
State Montana
Other Geospatial Philipsburg quadrangle
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details