UNT Libraries Government Documents Department - 14 Matching Results

Search Results

Volcanic Activity in the Aleutian Arc
Including a list of all known volcanoes and a summary of activity betwen 1760 and 1948.
The Eastern Front of the Bitterroot Range, Montana
From abstract: The origin of the gneissic rocks on the eastern border of the Idaho batholith in the Bitterroot Range, near Hamilton, Mont., has long been in dispute. Lindgren regarded these rocks as the product of stresses related to a normal fault along the front of the range with an eastward dip of about 150. He thought both the hanging wall and the footwall had moved, with a total displacement along the fault plane of at least 20,000 feet. The faulting was believed to have been so recent as to be a major factor in the present topography. Langton appears to accept the concept of faulting but to regard the gneissic rocks as formed much earlier from a granitic rock that was more silicic and older than the Idaho batholith.
Pecos National Monument, New Mexico: Its Geologic Setting
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.
Nonopaque Heavy Minerals in Sandstone of Jurassic and Cretaceous Age in the Black Hills, Wyoming and South Dakota
The following report describes the examinations of the nonopague heavy minerals in sandstone found in the Black Hills in northeastern Wyoming and western South Dakota. The studies were made to determine if differences in the shapes of the grains and proportions of minerals are sufficiently distinctive to be used in subdividing and correlating formations.
Geologic Reconnaissance of the Antelope-Ashwood Area North-central Oregon: With Emphasis on the John Day Formation of Late Oligocene and Early Miocene Age
From introduction: "This report briefly describes the geology of an area of about 750 square miles in Jefferson, Wasco, Crook, and Wheeler Counties, Oregon."
Geologic Reconnaissance Along the Alaska Highway, Delta River to Tok Junction, Alaska
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.
The Eagle Valley Evaporite, Northwest Colorado--A Regional Synthesis
The following report presents a regional study of the extent, thickness, lithology, stratigraphic relations, age, depositional environment, and tectonic history of thick sulfate deposits and associated salts of sodium and potassium.
Minor Elements in Bedrock Soil, and Vegetation at an Outcrop of the Phosphoria Formation on Snowdrift Mountain Southeastern Idaho
This report follows the geochemical study of bedrock soil and vegetation at an outcrop of the Phosphoria Formation of Permian age on Snowdrift Mountain, southeastern Idaho.
Geology of the Clark Fork Quadrangle Idaho-Montana
This report gives a brief geological description of the Clark Fork quadrangle on the Idaho-Montana border.
Cenozoic Geology in the Mammoth Area Pinal County, Arizona
From introduction: "The purpose of this report is to show how mapping of discrete units of the valley fill may lead to a broadened understanding of Cenozoic history of intermontane basins in Arizona. The area described is in the vicinity of Mammoth Arizona where deep dissection has exposed a complex sequence of terrestrial deposits and related rocks."
Surficial Geology of the Louisville Quadrangle, Colorado
This report analyzes surficial deposits in the Louisville quadrangle, Colorado, that are divided into three main groups--pre-Wisconsin, Wisconsin, and Recent.
Pleistocene and Recent Deposits in the Denver Area, Colorado
This report describes the stratigraphy of Pleistocene and Recent deposits in the Denver area, Colorado that was conducted intermittently between 1948-52.
Geology of the Duck Creek Pass Quadrangle, Montana
This report follows geological studies of the Duck Creek Pass quadrangle, Montana during the summers of 1956 and 1957.
Shorter Contributions to the Stratigraphy and Geochronology of Upper Cretaceous Rocks in the Western Interior of the United States
The following report presents measured sections and lithostratigraphic correlations of the units in the order to document a syntectonic unconformity in order to understand the tectonic history of the area.