The Hartville uplift is located on the southeast margin of the Archean Wyoming craton and exposes... more The Hartville uplift is located on the southeast margin of the Archean Wyoming craton and exposes Late Archean granite and gneiss and Late Archean or Early Proterozoic supracrustal rocks that were deformed during three, and possibly four, major compressional events in Early Proterozoic time, extending from-2.1 Ga to 1.76 Ga. The recognized events are (l) inversion of the supracrustal succession (D 1), at least in parts of the uplift, as a result of probable fold nappe formation; (2) folding of rocks on east-west axes (D2)in southern part of uplift; folds are open to tight, generally plunge westward, and verge southward; (3) west-vergent folding on northeast-trending axes and associated thickskinned thrusting (dominant deformation, D 3) in central and northern parts of uplift, with concomitant prograde metamorphism; and (4) local recumbent folds in southernmost part of uplift. The inverted succession probably constitutes the lower limb of a fold nappe (or nappes) that could have formed as an early phase of deformation D 2. Deformation D2 produced similar folds having a north-dipping axial planar cleavage; SO-S2 intersections (L2) plunge parallel to Deformation D2 deformed the supracrustal rocks and the Archean basement in the southern part of the and
Stratigraphic column of the Roan Group exposed in the Zambian part of the Central African Copperb... more Stratigraphic column of the Roan Group exposed in the Zambian part of the Central African Copperbelt showing the stratigraphic distribution of reduced-facies (argillite-hosted and mixed argillite-arenite) and sandstone (arenite-hosted
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey e... more This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been used by the USGS and have been successfully imported into a number of database and spreadsheet programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey e... more This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into a number of database and spreadsheet programs, no warranty, expresssed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
The daily data, for which the source agency is the National Climatic Data. Massive meteorological... more The daily data, for which the source agency is the National Climatic Data. Massive meteorological database that describes the climate of the Earth both Databases and spatial data model for mineralized areas, mines, and prospects in the Grand Mesa, Uncompahgre, and Gunnison GMUG national forests, Colorado Databases and spatial data model for mineralized areas, mines, and. There is concern that remedial action-related traffic in the area would result in. 77 FR 24673-Grand Mesa, Uncompahgre and Gunnison National Forests mining exposure having ever lived in a type A home uranium tailings home and Through its output database, the epi model couples to an economic model Databases and spatial data model for mineralized areas, mines, and prospects in the
A regionally-consistent and integrated geologic spatial database for the Northern Rocky Mountains... more A regionally-consistent and integrated geologic spatial database for the Northern Rocky Mountains of Montana, Idaho, and eastern Washington, brings together forty-three 1:100,000-to 1:250,000-scale digital geologic maps into a common database format. The regional geologic database is an ArcInfo® coverage (NR_GEO) that contains spatial data for both lines (contacts, faults, fold axes, dikes, sills, veins, garnet isograd, boundaries) and polygons (geologic units). The database represents the original content of the published maps and provides easily-used and consistent attribute content. We have also added information based on our interpretations of published reports. In particular, we have added attribute information that 1) classifies igneous rocks by age, composition, and name, and 2) allows the creation of derivative maps based on lithology. Three schemes are used to classify polygons and lines in this spatial database. The first scheme is based on the original map units defined in the source maps used to compile this database. The second approach uses the age, composition, and mode of occurrence to define igneous map units. The last approach uses the names of igneous intrusions and volcanic units to define map units. This database can be queried to address an assortment of geological questions and to produce a variety of derivative geological maps. Digital themes derived from these digital spatial geologic databases will be used by the U.S. Department of Agriculture Forest Service (USFS) for planning and research purposes and by the U.S. Geological Survey (USGS) to facilitate research and conduct mineral-resource assessments. We would like to thank Reed S. Lewis and Loudon R. Stanford with the Idaho Geological Survey and Karen Porter, Dick Berg, and Patrick Kennelly with the Montana Bureau of Mines and Geology for their cooperation in our effort to make this compilation. They worked with us to produce several new digital geologic maps and provided digital files of geologic maps and map-unit descriptions. They also answered numerous geologic questions that came up during the compilation process. Eastern Washington University students Rebecca Pitts, David Cleveland, Mike Koenig, and Richard D. West helped compile data. Ellen Burch, Information Systems Support, Inc., scanned map-unit descriptions and converted them to text format. Karen Lund and Mike O'Neill with the U.S. Geological Survey provided unpublished data for the database.
A relational database was created to prepare and organize geologic map-unit and lithologic descri... more A relational database was created to prepare and organize geologic map-unit and lithologic descriptions for input into a spatial database for the geology of the northern Rocky Mountains, a compilation of forty-three geologic maps for parts of Idaho, Montana, and Washington in U.S. Geological Survey Open File Report 2005-1235. Not all of the information was transferred to and incorporated in the spatial database due to physical file limitations. This report releases that part of the relational database that was completed for that earlier product. In addition to descriptive geologic information for the northern Rocky Mountains region, the relational database contains a substantial bibliography of geologic literature for the area. The relational database nrgeo.mdb is available in Microsoft Access version 2000, a proprietary database program. The relational database contains data tables and other tables used to define terms, relationships between the data tables, and hierarchical relationships in the data; forms used to enter data; and queries used to extract data.
The Crazy Mountains dike swarm is a radial array associated with the Eocene (approximately 49 Ma)... more The Crazy Mountains dike swarm is a radial array associated with the Eocene (approximately 49 Ma) Big Timber stock in the Crazy Mountains of south-central Montana. Dikes are hosted by the stock and by Paleocene Fort Union Formation rocks that host the stock. The spatial coincidence, field relations, and similarity of petrographic and geochemical features suggest that the dikes and the stock are cogenetic and coeval. The dikes depict a broad range of compositions, from rhyolite to basalt; dike composition is only weakly related to position relative to the Big Timber stock. The dikes range from 51 to 71 weight percent SiO 2 , a slightly more restricted range than that exhibited by the stock. Compositional variation among the dikes is less systematic than is characteristic of the stock; dike compositions form more broadly diffuse arrays and tend to be slightly more alkaline. Both of these factors could result from late-stage magmatic-hydrothermal processes that seem to have weakly altered many of the dikes. Major-oxide and trace-element characteristics of the dikes and the associated stock are consistent with a mantle-dominated genesis in a subduction-related volcanic arc setting. In addition to petrologic and geochemical data, new 40 Ar/ 39 Ar geochronologic data for strongly alkaline sills in the northern Crazy Mountains are also presented. Dates for the sills, which are peripheral to the Crazy Mountains dike swarm, indicate that alkaline magmatism was temporally associated with subalkaline magmatism represented by the Big Timber stock and related dikes. Characteristics of the subalkaline magmatism are consistent with renewed volcanic arc magmatism during the Eocene westward hingeline retreat and subsequent southwestward migration of the magmatic front in response to steepening subduction along the western edge of North America.
The following report is based on information contained in USGS mineral resource and commodity fil... more The following report is based on information contained in USGS mineral resource and commodity files, mineral information databases (MRDS and MAS), and on reports and maps available in the USGS library. These data are occasionally augmented with unpublished documents, personal communications, and professional experiences. No field studies or onsite visits were performed in preparing this report. Emphasis is primarily on locatable mineral resources. Leasable and salable resources are covered only if they appear in the above documents. Mineral resource assessments are subjective: the opinions expressed herein are entirely those of the author. This report has not been reviewed for stratigraphic nomenclature.
For an overview of USGS information products, including maps, imagery, and publications, visit ht... more For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.
The Hartville uplift is located on the southeast margin of the Archean Wyoming craton and exposes... more The Hartville uplift is located on the southeast margin of the Archean Wyoming craton and exposes Late Archean granite and gneiss and Late Archean or Early Proterozoic supracrustal rocks that were deformed during three, and possibly four, major compressional events in Early Proterozoic time, extending from-2.1 Ga to 1.76 Ga. The recognized events are (l) inversion of the supracrustal succession (D 1), at least in parts of the uplift, as a result of probable fold nappe formation; (2) folding of rocks on east-west axes (D2)in southern part of uplift; folds are open to tight, generally plunge westward, and verge southward; (3) west-vergent folding on northeast-trending axes and associated thickskinned thrusting (dominant deformation, D 3) in central and northern parts of uplift, with concomitant prograde metamorphism; and (4) local recumbent folds in southernmost part of uplift. The inverted succession probably constitutes the lower limb of a fold nappe (or nappes) that could have formed as an early phase of deformation D 2. Deformation D2 produced similar folds having a north-dipping axial planar cleavage; SO-S2 intersections (L2) plunge parallel to Deformation D2 deformed the supracrustal rocks and the Archean basement in the southern part of the and
Stratigraphic column of the Roan Group exposed in the Zambian part of the Central African Copperb... more Stratigraphic column of the Roan Group exposed in the Zambian part of the Central African Copperbelt showing the stratigraphic distribution of reduced-facies (argillite-hosted and mixed argillite-arenite) and sandstone (arenite-hosted
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey e... more This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been used by the USGS and have been successfully imported into a number of database and spreadsheet programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey e... more This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into a number of database and spreadsheet programs, no warranty, expresssed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
The daily data, for which the source agency is the National Climatic Data. Massive meteorological... more The daily data, for which the source agency is the National Climatic Data. Massive meteorological database that describes the climate of the Earth both Databases and spatial data model for mineralized areas, mines, and prospects in the Grand Mesa, Uncompahgre, and Gunnison GMUG national forests, Colorado Databases and spatial data model for mineralized areas, mines, and. There is concern that remedial action-related traffic in the area would result in. 77 FR 24673-Grand Mesa, Uncompahgre and Gunnison National Forests mining exposure having ever lived in a type A home uranium tailings home and Through its output database, the epi model couples to an economic model Databases and spatial data model for mineralized areas, mines, and prospects in the
A regionally-consistent and integrated geologic spatial database for the Northern Rocky Mountains... more A regionally-consistent and integrated geologic spatial database for the Northern Rocky Mountains of Montana, Idaho, and eastern Washington, brings together forty-three 1:100,000-to 1:250,000-scale digital geologic maps into a common database format. The regional geologic database is an ArcInfo® coverage (NR_GEO) that contains spatial data for both lines (contacts, faults, fold axes, dikes, sills, veins, garnet isograd, boundaries) and polygons (geologic units). The database represents the original content of the published maps and provides easily-used and consistent attribute content. We have also added information based on our interpretations of published reports. In particular, we have added attribute information that 1) classifies igneous rocks by age, composition, and name, and 2) allows the creation of derivative maps based on lithology. Three schemes are used to classify polygons and lines in this spatial database. The first scheme is based on the original map units defined in the source maps used to compile this database. The second approach uses the age, composition, and mode of occurrence to define igneous map units. The last approach uses the names of igneous intrusions and volcanic units to define map units. This database can be queried to address an assortment of geological questions and to produce a variety of derivative geological maps. Digital themes derived from these digital spatial geologic databases will be used by the U.S. Department of Agriculture Forest Service (USFS) for planning and research purposes and by the U.S. Geological Survey (USGS) to facilitate research and conduct mineral-resource assessments. We would like to thank Reed S. Lewis and Loudon R. Stanford with the Idaho Geological Survey and Karen Porter, Dick Berg, and Patrick Kennelly with the Montana Bureau of Mines and Geology for their cooperation in our effort to make this compilation. They worked with us to produce several new digital geologic maps and provided digital files of geologic maps and map-unit descriptions. They also answered numerous geologic questions that came up during the compilation process. Eastern Washington University students Rebecca Pitts, David Cleveland, Mike Koenig, and Richard D. West helped compile data. Ellen Burch, Information Systems Support, Inc., scanned map-unit descriptions and converted them to text format. Karen Lund and Mike O'Neill with the U.S. Geological Survey provided unpublished data for the database.
A relational database was created to prepare and organize geologic map-unit and lithologic descri... more A relational database was created to prepare and organize geologic map-unit and lithologic descriptions for input into a spatial database for the geology of the northern Rocky Mountains, a compilation of forty-three geologic maps for parts of Idaho, Montana, and Washington in U.S. Geological Survey Open File Report 2005-1235. Not all of the information was transferred to and incorporated in the spatial database due to physical file limitations. This report releases that part of the relational database that was completed for that earlier product. In addition to descriptive geologic information for the northern Rocky Mountains region, the relational database contains a substantial bibliography of geologic literature for the area. The relational database nrgeo.mdb is available in Microsoft Access version 2000, a proprietary database program. The relational database contains data tables and other tables used to define terms, relationships between the data tables, and hierarchical relationships in the data; forms used to enter data; and queries used to extract data.
The Crazy Mountains dike swarm is a radial array associated with the Eocene (approximately 49 Ma)... more The Crazy Mountains dike swarm is a radial array associated with the Eocene (approximately 49 Ma) Big Timber stock in the Crazy Mountains of south-central Montana. Dikes are hosted by the stock and by Paleocene Fort Union Formation rocks that host the stock. The spatial coincidence, field relations, and similarity of petrographic and geochemical features suggest that the dikes and the stock are cogenetic and coeval. The dikes depict a broad range of compositions, from rhyolite to basalt; dike composition is only weakly related to position relative to the Big Timber stock. The dikes range from 51 to 71 weight percent SiO 2 , a slightly more restricted range than that exhibited by the stock. Compositional variation among the dikes is less systematic than is characteristic of the stock; dike compositions form more broadly diffuse arrays and tend to be slightly more alkaline. Both of these factors could result from late-stage magmatic-hydrothermal processes that seem to have weakly altered many of the dikes. Major-oxide and trace-element characteristics of the dikes and the associated stock are consistent with a mantle-dominated genesis in a subduction-related volcanic arc setting. In addition to petrologic and geochemical data, new 40 Ar/ 39 Ar geochronologic data for strongly alkaline sills in the northern Crazy Mountains are also presented. Dates for the sills, which are peripheral to the Crazy Mountains dike swarm, indicate that alkaline magmatism was temporally associated with subalkaline magmatism represented by the Big Timber stock and related dikes. Characteristics of the subalkaline magmatism are consistent with renewed volcanic arc magmatism during the Eocene westward hingeline retreat and subsequent southwestward migration of the magmatic front in response to steepening subduction along the western edge of North America.
The following report is based on information contained in USGS mineral resource and commodity fil... more The following report is based on information contained in USGS mineral resource and commodity files, mineral information databases (MRDS and MAS), and on reports and maps available in the USGS library. These data are occasionally augmented with unpublished documents, personal communications, and professional experiences. No field studies or onsite visits were performed in preparing this report. Emphasis is primarily on locatable mineral resources. Leasable and salable resources are covered only if they appear in the above documents. Mineral resource assessments are subjective: the opinions expressed herein are entirely those of the author. This report has not been reviewed for stratigraphic nomenclature.
For an overview of USGS information products, including maps, imagery, and publications, visit ht... more For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.
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