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The Leadville North 7.5' quadrangle lies at the northern end of the Upper Arkansas Valley, where the Continental Divide at Tennessee Pass creates a low drainage divide between the Colorado and Arkansas River watersheds. In the eastern half of the quadrangle, the Paleozoic sedimentary section dips generally 20–30 degrees east. At Tennessee Pass and Missouri Hill, the core of the Sawatch anticlinorium is mapped as displaying a tight hanging-wall syncline and foot-wall anticline within the basement-cored structure. High-angle, west-dipping, Neogene normal faults cut the eastern margin of the broad, Sawatch anticlinorium. Minor displacements along high-angle, east- and west-dipping Laramide reverse faults occurred in...
Tags: 10Be, 26Al,
Belden Formation,
Buckeye Peak,
Bull Lake glaciation,
Camp Hale, All tags...
Chaffee Group,
Chicago Ridge,
Colorado,
Colorado River,
Cooper Hill,
Dotsero Formation,
Eagle County,
Eagle River,
East Fork Arkansas River,
Geomorphology,
Gray porphyry group,
Hornblende Latite Porphyry,
Lake County,
Laramide,
Leadville,
Leadville Limestone,
Leadville Quadrangle,
Lincoln Porphyry,
Manitou Dolomite,
Minturn Formation,
Missouri Hill,
Mosquito Range,
Mount Zion,
No Name Gulch,
Pinedale Glaciation,
Rio Grande rift,
Sawatch Quartzite,
Sawatch Range,
Sawatch anticlinorium,
South Park,
St. Kevin Granite,
Structural Geology,
Tennessee Creek,
Tennessee Park,
Tennessee Pass,
Turquoise Lake,
USA,
USGS Science Data Catalog (SDC),
United States,
Upper Arkansas River,
Upper Arkansas Valley,
White Porphyry Group,
cosmogenic nuclide,
neotectonics,
pre-Bull Lake glaciation, Fewer tags
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The Weldona 7.5' quadrangle is located on the semiarid plains of northeastern Colorado, along the South Platte River corridor where the river has incised into Upper Cretaceous Pierre Shale. The Pierre Shale is largely covered by surficial deposits that formed from alluvial, eolian, and hillslope processes operating in concert with environmental changes from the Pleistocene to the present. The South Platte River, originating high in the Colorado Rocky Mountains, has played a major role in shaping surficial geology in the map area, which is several tens of kilometers downstream from where headwater tributaries join the river. Recurrent glaciation (and deglaciation) of basin headwaters has affected river discharge...
Tags: Bijou Creek,
Bijou No 2 Reservoir,
Bull Lake glaciation,
Colorado,
Empire Reservoir, All tags...
Fort Morgan,
Front Range,
Geomorphology,
Greeley,
Jackson Reservoir,
Kersey,
Kiowa Creek,
Land Use Change,
Masters,
Milliron Draw,
Morgan County,
OSL,
Orchard,
Pinedale glaciation,
South Platte River,
U-series,
USA,
USGS Science Data Catalog (SDC),
United States,
Weld County,
Weldona,
Wildcat Creek,
alluvium,
argillic B horizon,
braided,
colluvium,
discharge,
dune,
eolian,
floodplain,
geologic map,
lignite,
luminescence,
meandering,
radiocarbon,
sand sheet,
sheetflood,
soil,
terrace, Fewer tags
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The Strawberry Butte quadrangle, scale 1:24,000, is a legacy map of the U.S. Geological Survey, made as part of the Montana Investigations Project to provide information on the stratigraphy, structure, and geologic history of the area. The quadrangle encompasses an area of about 132 km2 (51 mi2) in the southwest part of the Little Belt Mountains and is about 26 km (17 mi) north of White Sulphur Springs, county seat of Meagher County, Montana. Two contrasting geologic terranes form the area. The northern two-thirds of the quadrangle are underlain by Paleoproterozoic metagranite that contains some inclusions of metadiorite and biotite gneiss. A veneer of Middle Cambrian sedimentary rocks, including the Flathead Sandstone...
Types: Citation;
Tags: Allan Creek,
Allan Park,
Belt Supergroup,
Black Butte,
Black Butte Creek, All tags...
Black Butte Creek fault zone,
Black Butte Creek metallic mineral deposits,
Cabin Creek,
Calf Creek,
Cambrian conglomerate,
Cambrian trace fossils,
Cenozoic basin deposits,
Cenozoic faulting,
Cenozoic unconformities,
Central Montana uplift,
Copper Creek,
Eagle Creek,
East Fork Calf Creek,
Eocene erosion,
Eocene plutonism,
Hematite alteration after sulfide mineralization,
Indian Creek,
Iron Butte iron deposit,
Iron-silicate gossan,
Laccolith,
Laccoliths, Little Belt Mountains,
Land Use Change,
Lewis and Clark National Forest,
Lewis and Clark tectonic zone,
Little Belt Mountains,
Little Belt Mountains uplift,
Little Moose Creek,
Little Sheep Creek,
Meagher County,
Mesoproterozoic sedimentary rocks,
Metallic mineral deposits, Little Belt Mountains,
Middle Fork Calf Creek,
Mineralogy,
Montana,
Moose Creek,
Moose Creek Campground,
Moose Pass,
Neoproterozoic-Middle Cambrian tectonism,
Oblique-slip faulting,
Oligocene basalt,
Oligocene volcanism,
Paleoproterozoic metamorphic rocks,
Pole Creek,
Pre-Flathead unconformity,
Recurrent faulting,
Sheep Creek,
Squaw Creek,
Strawberry Butte,
Strike-slip faulting,
Structural Geology,
USA,
USGS Science Data Catalog (SDC),
United States,
Volcano Valley fault zone,
West Fork Calf Creek,
Woods Mountain laccolith, Fewer tags
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