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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions ArcGIS REST Service (1) Types ArcGIS REST Map Service (2) ArcGIS Service Definition (2) Downloadable (2) Map Service (2) Contacts Joel E Robinson John D Horton U.S. Geological Survey - ScienceBase Nicole Thomas Jonathan S Caine More... Categories Data (2) Tag Types Theme (2) Place (2) USGS Scientific Topic Keyword (2) Harvest Set (2) Tag Schemes USGS Thesaurus (2) Lithologic classification of geologic map units (1) None (1) Common geographic areas (2) ISO 19115 Topic Category (2) Marine Realms Information Bank (MRIB) keywords (1) none (1) More... View Results as: JSON ATOM CSV

Structural geologic orientation data for primarily Proterozoic aged rocks, eastern-central Rocky Mountain Front Range, Colorado This data release consists of point data digitized from structural geologic orientation symbols consisting of mostly foliations and lineations. The data comes from primarily Proterozoic aged rocks in the eastern-central Rocky Mountain Front Range of Colorado. Compilation of the data is from twenty-three geologic maps published by the U.S. Geological Survey and the Colorado Geological Survey between 1964 and 2009, primarily using 7.5-minute, 1:24,000 scale quadrangles. Structural geologic orientation data of planar features (e.g., foliations) and linear features (e.g., fold axes), both with associated attribute values of strike and trend, dip and plunge, location, elevation, and geologic unit were captured for more... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Colorado, GGGSC, Geology, Geophysics, and Geochemistry Science Center, MRP, Mineral Resources, All tags... Mineral Resources Program, Structural Geology, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), bedrock geologic units, data services, deformation (geologic), faulting (geologic), folding (geologic), foliation (geologic), geographic information systems, geologic maps, geologic structure, geoscientificInformation, geospatial datasets, lineation (geologic), location, Fewer tags Database for the geologic map of the central San Juan caldera cluster, southwestern Colorado This geodatabase contains all the geologic map information for the Geologic Map of the San Juan caldera cluster, southwestern Colorado and is part of U.S. Geological Survey Geologic Investigations Map Series I-2799. The San Juan Mountains are the largest erosional remnant of a composite volcanic field that covered much of the southern Rocky Mountains in middle Tertiary time. The San Juan field consists mainly of intermediate-composition lavas and breccias, erupted about 35-30 Ma from scattered central volcanoes (Conejos Formation) and overlain by voluminous ash-flow sheets erupted from caldera sources. In the central San Juan Mountains, eruption of at least 8,800 km3 of dacitic-rhyolitic magma as nine major ash... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Andesite, Ash-flow tuff, Basalt, Central San Juan Caldera Cluster, Central San Juan Mountains, All tags... Colorado, Geochemistry, Gunnison, Lava flow, Pyroclastic rock, Rhyolite, San Juan, Tuff, USGS Science Data Catalog (SDC), United States, Volcanic breccia, Volcanology, Welded tuff, caldera, faulting (geologic), faulting (geologic), geoscientificInformation, volcanic activity, volcanic activity, volcanic eruptions, volcanic features, volcanic rocks, volcanic rocks, volcanology, volcanology, Fewer tags