Filters: Tags: Metamorphic Rocks (X) > partyWithName: U.S. Geological Survey - ScienceBase (X)
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Black river-polished amphibolitic schist, west (left) bank of river mile 127.5.
Aerial view northwest toward Horn Creek Rapids, river mile 90.9, showing numerous pegmatite and granite dikes in black Vishnu Schist. Inner canyon is 1,300 feet deep here.
Aerial view south and downriver from river mile 211.9 toward a Precambrian “island” of schist (photographs WM07, WM08, WM09) during the basal Cambrian sea encroachment, right bank of river mile 212.5.
View west toward granite rocks (photograph WM01) on west side of river mile 190.1 from Hundred and Ninety Mile canyon.
View southwest and downriver toward Vishnu Schist below Tapeats Sandstone, river mile 112.6.
This U.S. Geological Survey (USGS) data release provides monazite and xenotime geochronology from Proterozoic rocks collected from outcrop in central Colorado and whole rock isotope geochemistry, and zircon and monazite geochronology from a Proterozoic rock sampled from a drill core from western Colorado. The drill core sample was collected from the 1 Paradox Valley injection core near Bedrock, CO at a depth of 4,755-4,765 m below the surface. The samples were in order to constrain the age, provenance, metamorphic history, and geochemical character of basement terranes in Colorado.
Categories: Data;
Tags: Colorado,
Geochemistry,
USGS Science Data Catalog (SDC),
USGS:63bed9e9d34e92aad3cda906,
geochemistry,
This dataset is intended to provide seamless, integrated geologic mapping of the U.S. Intermountain West region as a contribution to The National Geologic Map supported by the National Cooperative Geologic Mapping Program of the U.S. Geological Survey. Surficial and bedrock geology are included in this data release as independent datasets at a variable resolution from 1:50,000 to 1:250,000 scale. No original interpretations are presented in this dataset; rather, all interpretive data are assimilated from referenceable publications. Derivative polygon features created for this dataset demonstrate the distribution of SIGMa-GeMS Geologic Provinces derived from the distribution of map units. Initial contributions to...
The geology of an area of 660 square miles mostly in the northeastern corner of Tennessee and small adjacent areas in Virginia and North Carolina is the subject of this report. The region lies principally in the Unaka province, with extensions northwestward into the Appalachian Valley and southwestward into the Blue Ridge province. The report combines results of surveys made between 1941 and 1953 by the U. S. Geological Survey, the Tennessee Division of Geology, and the Tennessee Valley Authority, and is published in cooperation with the Tennessee Division of Geology. Northeasternmost Tennessee is a region of widespread mineralization and was formerly important for mineral production. Iron, manganese, and bauxite...
River-polished Vishnu Schist, north bank of Crystal Rapids, river mile 98.7.
View northwest toward southeast side of Precambrian Zoroaster Granite “island” of Cambrian seaway, onlapped by Cambrian Tapeats Sandstone, from Tonto Trail, south of river mile 85.1.
View southeast and downriver toward metamorphic rocks with granitic dikes, north of Granite Park, river mile 208.2.
Pegmatite dikes in schist, south bank of river mile 80.5.
Overview This directory was developed to provide discovery information for anyone looking for publicly accessible repositories that house geological materials in the U.S. and Canada. In addition, this resource is intended to be a tool to facilitate a community of practice. The need for the directory was identified during planning for and follow-up from a drill core repository webinar series in Spring 2020 for public repository curators and staff in the U.S. and Canada hosted by the Minnesota Geological Survey and the Minnesota Department of Natural Resources. Additional supporting sponsors included the U.S. Geological Survey National Geological and Geophysical Data Preservation Program and the Association of American...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Alabama,
Alaska,
Alberta,
Arkansas,
British Columbia,
Aerial view north into Clear Creek canyon, about 1 mile north of river mile 84.7. View of vertical beds of Paleoproterozoic Vishnu Schist overlain by horizontal Cambrian Tapeats Sandstone (brown cliff) in foreground, and tilted Mesoproterozoic Bass Formation in distance, that marks the Great Unconformity.
View west and downriver toward lower part of Paleoproterozoic Zoroaster Granite “island” with pegmatite and granite intrusions into black Vishnu Schist on south side of river mile 85.7. Tapeats Sandstone at skyline.
Aerial view west toward Bright Angel Creek delta (lower right center of photograph) and two Colorado River foot bridges to Phantom Ranch in Bright Angel Creek from over river mile 88.0. Upper black Kaibab Suspension Bridge is for mules and people crossing, lower gray Silver Bridge is for people and water pipeline crossing. Bass Formation (cliffs) and overlying red slope of Hakatai Shale (photograph EM17) at left overlies Precambrian metamorphic rocks.
View south and downriver toward Diamond Peak (Redwall Limestone peak); schist and granite below Tapeats Sandstone cliff and Bright Angel Shale slope on west side of river mile 221.6.
View west and downriver toward granite and gneiss in Lower Granite Gorge near Two Hundred and Thirtyfour Mile canyon, river mile 233.5.
View downriver and northwest toward beginning of Granite Narrows, with metamorphic rocks and granitic intrusions, lower left of photograph (photograph CM10). River mile 135.5.
View west and downriver toward Paleoproterozoic Vishnu Schist metamorphic complex from river mile 78.4. Greatest Angular Unconformity is between schist and overlying east-dipping strata of Mesoproterozoic Bass Formation. White talus of Hance asbestos mine at Cardenas Basalt sill within Bass Formation, upper right of photograph.
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