Abstract: In the Blue Ridge Province of northern Virginia, Maryland, and southern Pennsylvania, Lower Cambrian beds are underlain by a thick sequence of greenstone and interbedded sedimentary rocks known as the Catoctin Formation. An area near Luray, Va., was studied to determine the thickness of the formation, its relationship to overlying and underlying rocks, and the original nature of the lavas from which the Catoctin greenstone was derived. There the Catoctin Formation lies unconformably on granitic rocks. Its basal sedimentary layer ranges from a few inches to 150 feet in thickness and contains pebbles of underlying basement rocks. The erosion surface beneath the Catoctin is irregular, and in several places, hills as much as 1,000 feet high were buried beneath the Catoctin lavas. No important time break is indicated between the deposition of the Catoctin Formation and the overlying Cambrian sediments. The original Catoctin lavas were basaltic and were probably normal plateau basalts. Columnar joints, amygdules, sedimentary dikes, flow breccias, low-dipping primary joints, and other primary structures are well preserved.

From abstract: Small deposits of native gold are present along an anastomosing system of quartz veins and shear zones just east of Great Falls, Montgomery County, Md. The deposits were discovered in 1861 and were worked sporadically until 1951, yielding more than 5,000 ounces of gold. The vein system and the principal veins within it strike a few degrees west of north, at an appreciable angle to foliation and fold axial planes in enclosing rocks of the Wissahickon Formation of late Precambrian (?) age. The veins cut granitic rocks of Devonian or pre-Devonian age and may be as young as Triassic. Further development of the deposits is unlikely under present economic conditions because of their generally low gold content and because much of the vein system lies on park property, but study of the Great Falls vein system may be useful in the search for similar deposits elsewhere in the Appalachian Piedmont.

From introduction: The ruins of the pueblos and missions of Pecos lie on the east bank of Glorieta Creek near its junction with the Pecos River at the south end of the Sangre de Cristo Mountains in north-central New Mexico. Here the Pecos River and Glorieta Creek have formed a broad rolling valley in which the red adobe walls of the mission church stand as a striking monument to a historic past.

From introduction: Much of the ground surface around Mount Rainier volcano is directly underlain by loose geologic deposits that veneer the hard rock formations. Examples of these deposits are sand and gravel bars along the rivers, ridges of loose rock debris beside the glaciers, and sloping aprons of rock fragments beneath almost every cliff. Even though they are generally thin and inconspicuous when compared with the rock formations, these surficial deposits are clues to geologic events that. have profoundly influenced the shape of the park's landscape. Thus, from the character and extent of glacial deposits one can judge the age and size of former glaciers that carved the cirques and deep canyons of the park; from the mudflows which streamed down nearly every valley one can infer the age and size of huge landslides of the past that helped determine Mount Rainier's present shape; and from the pumice deposits some of the volcano's recent eruptive activity can be reconstructed.

A bibliography on impact structures by that supplements the U.S. Geological Survey Bulletin 1220 by citing literature published or reviewed since 1964.

A report that analyses samples of copper mosses and their substrates and compares these analyses with those published elsewhere.

A report about the Schreinemakers method and the creation of pressure temperature diagrams for multicomponent systems.

The following report presents the geology and mineral resources of part of the Anaconda quadrangle near Butte, Montana.

The following report presents an evaluation of the mineral potential of the Spanish Peaks primitive area, Montana.

The following report is an evaluation of mineral potential of the Stratified Primitive Area in Wyoming.

A report that fits in a series of reports that are about changes in stratigraphic nomenclature and that will list publications in which the changes have been describes. It deals with stratigraphy, including those defining changes in stratigraphic nomenclature in reports of the U.S. Geological Survey.

A report about two new geologic formations in Wyoming. The Foote Creek Formation consists of beds of fine-grained sandstone with shale, siltstone, and coal beds. The Dutton Creek Formation consists of beds of coarse-grained locally conglomeratic sandstone.

The following report studies results from the bedrock and surficial geologic reconnaissance of the middle section of the Tanana lowland and adjacent parts of the Alaska Range and the Yukon-Tanana upland.

A report about the Jefferson Formation and the Three Forks Formation. Both of them constitute a sequence of dominantly marine rocks.

A report about the coal-bearing rocks found in Lawrence County, Pennsylvania. Lawrence County is in west-Central Pennsylvania in the northern part of the Appalachian coal field.

This report records the distribution, thickness, and reserves of coal in Lawrence County, Pennsylvania.

A report describing the geology of a few counties in Oregon. Strata is exposed that ranges in age from pre-Tertiary to Quaternary.

From introduction: "This report briefly describes the geology of an area of about 750 square miles in Jefferson, Wasco, Crook, and Wheeler Counties, Oregon."

"A detailed estimate of the reserves of coal in Alabama and a description of the stratigraphy of the coal-bearing rocks."

A report about the Powder River Basin in northeastern Wyoming which is a physiographic unit bounded on the west by the Bighorn Mountains. There are sedimentary rocks which range in age from Cambrian to Oligocene.

This report follows the geological field studies of uranium deposits near Pumpkin Buttes in the central part of the Powder River Basin, Wyoming, and eventually moving south of the basin.

A report about the Geology of three locations in Nebraska. Each location primarily are made up of Shale and chalk of Late Cretaceous age.

The following report was prepared as part of a program of the Department of the Interior for the development of the Missouri River basin. The report focuses on the study of the geology of part of south-central Nebraska, with emphasis on the deposits of the Pleistocene age and their engineering characteristics.

From introduction: "This report continues the systematic account of conditions at Hawaiian volcanoes begun in earlier reports of this series."