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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
This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed geologic mapping of poorly understood areas within the map area and reinterprets previously studied areas, aided by lidar data that covers 59 percent of the map area. The mapped region extends into the Proterozoic metamorphic and intrusive rocks in the Sawatch Range west of the valley and the Mosquito Range to the east. Paleozoic...
Categories: Data;
Tags: 207Pb/206Pb zircon age,
40Ar/39Ar age,
Arkansas River,
Balltown,
Balltown placer gold mining areas, All tags...
Belle of Granite Mine,
Big Union Creek,
Bishop ash,
Black Cloud Mine,
Black Mountain,
Browns Canyon,
Browns Canyon fluorspar mining district,
Browns Creek,
Buckskin Gulch,
Buena Vista,
Buffalo Creek,
Buffalo Peaks,
Bull Lake glaciation,
Cache Creek,
California Gulch,
California Mine,
Centerville,
Chaffee County,
Chalk Creek,
Clear Creek,
Clear Creek Reservoir,
Colorado,
Cottonwood Creek,
Dry Union Gulch,
Eagle County,
Eagle River,
East Fork Arkansas River,
Eddy Creek,
Elephant Rock,
Fremont County,
Front Range,
Garfield,
Garfield Mine,
Garfield mining district,
Gordon Mine,
Granite,
Granite mining district,
Granite placer gold mining areas,
Hayden Gulch,
Homestake Reservoir,
Iowa Gulch,
Johnson Village,
Lake County,
Lake Creek,
Langhoff Gulch,
Lava Creek B ash,
Leadville,
Leadville mining district,
Lilly Mine,
London Mine,
Malta,
Maysville,
Mesozoic rocks,
Morrison Creek,
Mosquito Range,
Mount Aetna,
Mount Antero,
Mount Antero mining district,
Mount Princeton,
Mount Shavano,
Mount Yale,
Paleozoic rocks,
Park County,
Pine Creek,
Pinedale glaciation,
Pitkin County,
Poncha Springs,
Proterozoic rocks,
Quaternary deposits,
Rio Grande rift,
Riverside,
Rock Creek,
Ruby Mine,
Ruby Mountain,
San Juan Mountains,
Sangre de Cristo Range,
Sawatch Range,
Sedalia Mine,
Sedalia copper-zinc mining district,
South Arkansas River,
South Park,
South Platte River,
Squaw Creek,
St. Kevin mining district,
Structural Geology,
Sugar Loaf mining district,
Sugarloaf Mountain,
Tennessee Creek,
Tertiary rocks,
Triad Ridge,
Trout Creek,
Trout Creek Pass,
Trout Creek paleovalley,
Tumble Creek,
Turquoise Lake,
Twin Lakes Reservoir,
Twin Lakes mining district,
Two Bits mining district,
USA,
USGS Science Data Catalog (SDC),
United States,
Western Alma mining district,
Weston Pass,
Weston Pass mining district,
Yankee Blade Mine,
alluvial deposits,
alluvium,
andesite,
artificial-fill deposits,
augen gneiss,
basalt,
basin-fill deposits,
breccia,
colluvium,
copper,
cosmogenic surface-exposure age,
dacite,
debris flow,
debris-flow deposits,
diamicton,
diorite,
eolian deposits,
fan deposits,
fault,
faulting,
fluorspar,
fluvial deposits,
gabbro,
glacial deposits,
glacial flood deposits,
glacial flood gravel,
glaciofluvial deposits,
gneiss,
gold,
graben,
granite,
granitic gneiss,
granodiorite,
gravel,
hydrologic hazards,
hypabyssal rhyolite,
intrusive rock,
lahar deposit,
lamprophyre,
landslide deposits,
latite,
lava,
lead,
leucogranite,
leucogranite gneiss,
lidar imagery,
man-made deposits,
mass-movement deposits,
mass-movement hazards,
metabasalt,
metagabbro,
metaigneous rocks,
metasedimentary rocks,
metavolcanic rocks,
microtonalite,
mine,
mine-waste deposits,
mineral deposits,
mining district,
monzodiorite,
monzogranite,
monzonite,
mud-flow deposits,
neotectonics,
ore,
outwash,
outwash gravel,
peat deposits,
pegmatite,
periglacial,
placer gold,
placer-tailings deposits,
porphyry,
pre-Bull Lake glaciation,
quartz diorite,
quartz latite,
quartzite,
rhyodacite,
rhyolite,
rift,
rock-glacier deposits,
sackungen,
sand and gravel resources,
scarp,
schist,
sedimentary rocks,
seismic hazards,
silver,
smelter-slag deposits,
soil,
surficial deposits,
talus deposits,
till,
tuff,
volcanic ash,
volcanic breccia,
volcanic rock,
weathering,
wetland deposits,
zinc, Fewer tags
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