Technical Report Archive & Image Library (TRAIL) - 344 Matching Results
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- Muscovite in the Spruce Pine District, North Carolina
- From Abstract: "This report describes the occurrence of the mica and its physical properties among which is an unusually wide range of colors. A table is presented showing the results of power-factor measurements made by the National Bureau of Standards on 196 samples of sheet mica from 109 mica mines and 15 feldspar mines.It is concluded that more systematic planning of mica mining, for the district as a whole. would result in an average yearly production of at least 90,000 pounds of relatively clear sheet and possibly much more."
- The Slumgullion Earth Flow: A Large-Scale Natural Laboratory
- A report about the Slumgullion slide and landslides. It discusses climate changed and how landslides are measured.
- Clastic Pipes of Probable Solution-Collapse Origin in Jurassic Rocks of the Southern San Juan Basin, New Mexico
- A report about pipes which contain downdropped strata located in the southwestern part of the San Jun Basin, New Mexico.
- Patterns of Diagenesis in Lower and Middle Pennsylvania Sandstones of the Illinois Basin, Illinois, Indiana, and Kentucky.
- This following report discusses the study of Lower and Middle Pennsylvanian sandstones of the Illinois Basin examined for evidence of regional diagenetic and fluid-flow patterns.
- Gazetteer of Planetary Nomenclature 1994
- A report about nomenclature related to planets in the solar system. It contains detailed information about all names of topographic and albedo features on planets and satellites.
- The Sedimentary Carbonate-Hosted Giant Bayan Obo REE-Fe-Nb Ore Deposit of Inner Mongolia, China: A Cornerstone Example for Giant Polymetallic Ore Deposits of Hydrothermal Origin
- A report which describes the overall characteristics of Bayan Obo ore deposit. The paper examines Bayan Obo as a cornerstone example of giant ore deposits of hydrothermal origin.
- Cowtrack Mountain and Glass Mountain Quadrangles, California and Nevada—Analytic Data
- A paper about modal and major-element chemical data on the Mesozoic plutonic rocks of the Cowtrack Mountain and Glass Mountain quadrangles are presented in tables, maps, and diagrams.
- The Seaman Volcanic Center—A Rare Middle Tertiary Stratovolcano in Southern Nevada
- A report about the Seaman volcanic center which is a composite, middle Tertiary stratovolcano in southern Nevada.
- Problems with Applying Topographically Driven Flow to Genesis of the Upper Mississippi Valley Zinc-Lead District and to Fluid Flow in the Illinois Basin
- A report about how topographically driven ground-water flow and other processes that involve dewatering of basins fail to account for the temperatures indicated by fluid inclusion and sulfur isotope studies in the Upper Mississippi Valley zinc-lead district on the northern edge of the Illinois Basin.
- Distribution of Benthic Foraminifers (>125 µm) in the Surface Sediments of the Arctic Ocean
- A report which discusses the distribution of benthic foraminifers in surface sediment samples from 49 box cores collected by the U.S. Geological Survey.
- Comparison of the Cretaceous-Tertiary Boundary Impact Events and the 0.77-Ma Australasian Tektite Event: Relevance to Mass Extinction
- A report that discusses the interpretation of impact shock evidence found in the K-T boundary sections and discusses the constraints imposed by the Australasian tektites and microtektites on the role of the 180-km Chicxulub crater in mass extinction.
- An Overview of Pleistocene and Holocene Inland Dunes in Georgia and the Carolinas--Morphology, Distribution, Age, and Paleoclimate
- A report about dunes which are vegetated, inactive, and are made of quartz.
- Regional Thermal Metamorphism and Deformation of the Sitka Graywacke, Southern Baranof Island, Southeastern Alaska
- A report about thermally metamorphosed rocks under Southern Baranof Island. It represents one of the largest regions of metamorphosed rock.
- Paleomagnetic and 40Ar/39Ar Results from the Grant Intrusive Breccia and Comparison to the Permian Downeys Bluff Sill—Evidence for Permian Igneous Activity at Hicks Dome, Southern Illinois Basin
- A report about applying 40Ar/39Ar dating methods, along with other rock techniques, to determine the age of emplacement and the cooling history of the Grant intrusive breccia at Hicks dome in Illinois.
- Response Plan for Volcano Hazards in the Long Valley Caldera and Mono Craters Region, California
- A report about volcano response plans. It discusses a four-level color code with successive conditions. For instance, green means no risk while red means an eruption is occurring.
- Chronology of Late Cretaceous Igneous and Hydrothermal Events at the Golden Sunlight Gold-Silver Breccia Pipe, Southwestern Montana
- A report about gold mineralization at the Golden Sunlight breccia pipe, southwestern Montana, is related to emplacement of Late Cretaceous alkali-calcic rhyolite and subsequent collapse of the Belt Supergroup wallrock and rhyolite in the pipe.
- Hydrothermal Alteration in the Mount Hood Area, Oregon
- A report which describes the hydrothermal alteration of numerous outcrop samples collected in the vicinity of Mount Hood, as well as drill cuttings from 13 of the geothermal drill holes for which we were able to obtain sample splits.
- Coastal Sedimentation Along a Segment of the Interior Seaway of North America, Upper Cretaceous Baxter Shale, and Blair and Rock Springs Formations, Rock Springs Uplift, Southwest Wyoming
- A report which examines the sedimentary rocks deposited along a segment of the west coast of the interior seaway of North America in southwest Wyoming during the late Santonian and early Campanian subages of the Late Cretaceous Epoch.
- Rockfalls and Debris Avalanches in the Smugglers Notch Area, Vermont
- A report about rockfalls and debris avalanches on the southern approach to Smuggles Notch in Vermont.
- Colorado Yule Marble—Building Stone of the Lincoln Memorial
- A report about the quality and consistency of the Colorado Yule marble mined in Marble, Colorado.
- Isotopic Ages and Stratigraphy of Cenozoic Rocks of the Marysvale Volcanic Field and Adjacent Areas, West-Central Utah
- A report about the Marysvale volcanic field that lies at the east end of the Pioche-Marysvale igneous belt.
- Source Rock Potential of the Lower Part of the Mississippian St. Louis Limestone in South-Central Indiana
- A report about the carbonate-evaporite sequence of the lower part of the Mississippian St. Louis Limestone. There is organic rich strata that may be good to excellent hydrocarbon source rocks.
- Paleocene Vertebrates from Jabal Umm Himar, Kingdom of Saudi Arabia
- A report about fossils in Saudi Arabia. The report discusses locality, higher taxon, and specimens within the taxon from a given locality.
- Geologic Controls of Deep Natural Gas Resources in the United States
- A report about the natural gas drilling frontier in deep sedimentary basins. Papers presented here are intended to introduce the petroleum community to a set of geologic tools that may be used to predict deep undiscovered natural gas accumulations.
- Environmental Considerations of Active and Abandoned Mine Lands: Lessons from Summitville, Colorado
- A report about some of the environmental impacts of the Summitville open-pit mine that was abandoned after 1992.
- Timing and Effect of Detachment-Related Potassium Metasomatism on 40Ar/39Ar Ages from the Windous Butte Formation, Grant Range, Nevada
- A report about studying volcanic rocks. It discusses faults, thermal, and chemical problems.
- Past Lode-Gold Production from Alaska
- From abstract: This report presents an analysis of the statistical records of the Geological Survey regarding the production of lode gold from the Territory of Alaska for the period 1882 to 1937, inclusive. During that time lode gold to the value of $172,368,000 had been mined. The history of the discovery of lode gold and the early developments in lode-gold mining in each of the various districts is outlined briefly, and the production of lode gold in each of the geographic subdivisions is tabulated fully for each year, as far as the records and the practices of the Geological Survey permit.
- Occurrences of Molybdenum Minerals in Alaska
- Abstract: In the accompanying report reference is made to all of the deposits in Alaska in which molybdenum minerals have been definitely recognized and reported. None of the deposits have been mined commercially, and none of them have been prospected thoroughly enough to afford quantitative estimates as to their tenor and potential reserves ; in fact, at only a few of the localities has there been more than surficial testing. Forty-one separate and distinct localities where molybdenum minerals occur are listed, and the available information on factors of geologic significance regarding each occurrence is given. A small-scale map of Alaska on which the various localities are indicated forms part of the bulletin, and in the text are extensive references to the various published reports and records of the Survey upon which the statements are based. In spite of the widespread distribution of molybdenum mineralization in Alaska, the remoteness of many of the localities, their handicap through dearth of transportation facilities and labor supplies, and the already wellsupplied condition of the American market for molybdenum ores discourage the early development of any of the known deposits or search for them in unsurveyed areas. These draw-backs will doubtless become -less important factors as the settlement and development of Alaska as a whole takes place. It is, therefore, with a view to the future that one must consider these deposits, and from that standpoint it becomes evident that some of them merit watchful consideration.
- Geology and Oil Resources Along the Southern Border of San Joaquin Valley, California
- From abstract: The region described in this report includes a foothill belt of the San Emigdio and Tehachapi Mountains along the southern border of San Joaquin Valley. The belt displays portions of the rugged granitic cores of the mountains and also rocks of Eocene, Oligocene, Miocene, Pliocene, and Pleistocene age. Although there is thus a complete representation of the geologic series from the Eocene to the Pleistocene, some portions of the different series are wanting because of major faults and overlaps. The thickness of the Tertiary rocks (Eocene to Pliocene) varies considerably but has a maximum of about 29,000 feet. Miocene and Pliocene rocks cover most of the area investigated.
- The Forsyth Coal Field: Rosebud, Treasure, and Big Horn Counties, Montana
- From introduction: acknowledgements.-The Forsyth field was examined to collect data upon which to classify the public land included in it with regard to its value as coal land. The geologic mapping was done with the plane table and telescopic alidade, and all locations were tied to land corners.
- Contributions to Economic Geology (Short Papers and Preliminary Reports), 1911: Part 1 -- Metals and Nonmetals Except Fuels
- From introduction: The growing economic importance of the Carrville district, Trinity County, California merits notice, and it is hoped that this brief report will direct attention toward it, to the end that mining in general may be benefited.
- Reconnaissance of Some Gold and Tin Deposits of the Southern Appalachians: With Notes on the Dahlonega Mines
- From introduction: This report is a brief preliminary study of the mineral resources of a portion of the Piedmont region.
- Mineral Resources of Alaska: Report on Progress of Investigations in 1913
- From preface: The present volume is the tenth of a series of annual bulletins treating of the progress of mining in Alaska and summarizing the results achieved during the year in the investigations of the mineral resources of the Territory.
- Stratigraphy and Paleontology of the Upper Carboniferous Rocks of the Kansas Section
- From introduction: This report presents the results of reconnaissances on the coal formations of the area of Kansas south of the Kansas River.
- Mineral Resources of Kenai Peninsula, Alaska
- From introduction: This report details the mineral resources of Kenai Peninsula.
- Limestones of Southwestern Pennsylvania
- From introduction: This report is a summary of the present knowledge of limestone beds in southwestern Pennsylvania.
- The Mining Districts of the Western United States
- From introduction: This is the most current attempt to locate all the mining districts of the western states.
- Zinc and Lead Deposits of Northwestern Illinois
- From introduction: The subject of this paper is the district of the extreme northwestern portion of Illinois, included in the upper Mississippi Valley containing zinc and lead.
- [Reports on the Juneau and Admiralty Island Areas, Alaska]
- From introduction: From introduction: The present report upon the work of this field season is accompanied by topographic and geologic maps of the vicinity of Juneau, and of a mainland strip extending approximately 200 miles along the coast.
- The Gold Placers of the Fortymile, Birch Creek, and Fairbanks Regions, Alaska
- From letter of transmittal: This report contains the economic results of a reconnaissance of these gold fields of the Yukon basin which was carried out in 1903.
- The Calcite Marble and Dolomite of Eastern Vermont
- From introduction: The object of this bulletin is twofold-to locate definitely and to describe accurately the marbles and dolomites of eastern Vermont, with a view to setting forth their possible economic uses and to discuss whatever features of scientific interest they may present.
- Economic Geology of the Independence Quadrangle, Kansas
- From introduction: The aim of this paper is to present the substance of what is known concerning the distribution, occurrence, and development of the oil and gas of the quadrangle, and to note briefly the more important industries growing out of these natural resources or depending on them within the territory considered.
- The Glacier National Park: a Popular Guide to its Geology and Scenery
- From introduction: This report is a guide to the geology and scenery of Glacier National Park.
- Oil Fields of the Texas-Louisiana Gulf Coastal Plain
- From introduction: This report presents the findings of surveys of the extent of the oil fields in the gulf coastal plain.
- The Fairhaven Gold Placers, Seward Peninsula, Alaska
- From letter of transmittal: This manuscript is based on geologic and topographic reconnaissance survey, made during the summer of 1903, of an important placer-gold district in the northeastern part of Seward Peninsula.
- Results of Primary Triangulation and Primary Traverse: fiscal year 1903-04
- From introduction: This report contains the results of primary triangulation and primary traverse in the eastern and western divisions of the United States.
- Methods and Costs of Gravel and Placer Mining in Alaska
- From letter of transmittal: It is believed that this report will stimulate the mining industry by making available, in compact form, the accumulated results of the experience of mining men in this field and by directing attention to those mining methods developed in older districts which appear to be adapted to the conditions prevailing in Alaska.
- Some Mining Districts in Northeastern California and Northwestern Nevada
- From preface: This report satisfies the demand of the public for reliable information and to gather data which should be of use in planning further geologic work in Nevada.
- Geology and Ore Deposits of Lemhi County, Idaho
- From introduction: The present report embodies the results of reconnaissance studies in the nineteen mining districts of Lemhi County, Idaho.
- Contributions to Economic Geology (Short Papers and Preliminary Reports), 1913: Part 2 -- Mineral Fuels
- From introduction: This report determines the geographic distribution and thickness of the bituminous shale, or oil shale, or tar shale of the Green River formation of the Uinta Basin in Colorado and Utah.