Report discussing the results of geological studies that have been conducted in the Clancy Creek in the Jefferson City Quadrangle of Jefferson County, Montana. The location is of interest due to the discovery of several radioactivity anomalies and secondary uranium minerals in the area.

Report describing the geology and structural features of the Comet area of Jefferson County, Montana.

Report discussing uranium occurrences in carbonaceous shale and lignite beds in areas of the Townsend and Helena Valleys in Montana.

Discussing uranium in carbonaceous rocks in the Townsend and Helena Valleys, Montana

Abstract: A number of radioactivity anomalies and secondary uranium minerals have been found in the Rimini area near the northwestern margin of the Boulder batholith. Most of the anomalies are associated with chalcedonic vein zones that consist of one or more veins of cryptocrystalline and fine-grained quartz in silicified quartz monzonite and alaskite. Seventeen of the anomalies were found along veins that contain base and precious metals; nine were along veins in the vicinity of the village of Rimini from which there has been production of lead, silver, zinc, and gold.

A preliminary report regarding the Comet Area, in the Jefferson City Quadrangle Jefferson County, Montana. This report contains work done on behalf of the Division of Raw Materials of the U. S. Atomic Energy Commission.

From introduction: This report on the geology of the Powder River Basin is one of a series of reports by the Geological Survey on sedimentary basins in the United States.

From introduction: This report details the reconnaissance for uraniferous lignites in North Dakota, South Dakota, Montana, and Wyoming during 1948 and 1949.

Report discussing a geological study performed to find uraniferous lignites in North Dakota, Eastern Montana, north-central Wyoming, and northwestern South Dakota. "Deposits of uraniferous lignites were discovered at Blue Buttes, eastern Montana; and at North Cave Hills, South Cave Hills, and at Slim Buttes in northwestern South Dakota."

Report presenting new data on the age of the Boulder, Philipsburg, and Idaho batholiths of western Montana.

Report discussing an investigation of the stratigraphy of the Phosphoria formation in Montana. The investigation took from 1949 to 1950, and this report includes about half of the data collected. Analytical data and abstracts of several locations' stratigraphic sections are included.

From introduction: The purpose of the study is to evaluate the economic possibilities of radioactive lignites and to determine the geologic factors controlling the accumulation of uranium in lignite.

Report discussing investigations seeking uranium in deposits of black shale around the geographical areas of the Western States

A report about uranium bearing lignite beds which are 1.5 to 8 feet thick that occur in the Fort Union formation of the southern part of the Ekalaka Hills, Carter County, Montana.

Report discussing an investigation of the Centennial Range of Montana and Idaho, and the phosphate deposits of this area. Information on the geology of the area and deposits are given as well as information regarding the quality and location of phosphate deposits.

A preliminary report on the geology of the phosphate deposits located in the Centennial Range in Montana and Idaho.

Abstract: Secondary minerals of the uranite group occur in dense quartz veins and in altered aplitic granite along and near the crest of the east-trending ridge about one mile west of Clancy, Montana. Brief examination suggests that the radioactive minerals are erratically distributed, but a more thorough study of the area will be made by the Geological Survey during the coming field season.

Report describing the phosphorite deposits of the western United States with the objective of outlining features that are common to both the Kara Tau phosphorite deposits of Russia and the western United States deposits in an effort to define their origin.

Report discussing investigation of the relation of uranium and phosphate in the Phosphoria formation and its close stratigraphic equivalents.

A report regarding the geology and mineralogy of the W. Wilson. Mine near Clancey, Jefferson County, Montana. This report concerns work done on behalf of the division of Raw Materials of the U.S. Atomic Energy Commission.

Report discussing the U.S. Geological Survey's investigation of the stratigraphy of the Phosphoria formation in Montana. Abstracts of stratigraphic sections and analytical data is included.

From introduction: This report evaluates four possible types of subsurface reservoirs for radioactive wastes in the Williston basin.

A report about the Lemhi Pass area in the Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana, which was undertaken to determine the area as a potential source of thorium.

From introduction: This preliminary report details the geology and mineral deposits of the northern Elkhorn Mountains, Montana.