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Data release for Geologic Map of the Leadville North 7.5' quadrangle, Eagle and Lake Counties, Colorado


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Ruleman, C.A., Brandt, T.R., Goehring, B.M., and Caffee, M.A., 2018, Data release for Geologic Map of the Leadville North 7.5' quadrangle, Eagle and Lake Counties, Colorado: U.S. Geological Survey data release,


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 the core of the north-plunging [...]


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SIM3400.txt 57.47 KB 421 MB


Land-use planners of many kinds (including National Forest managers, developers, city and rural planners, and highway builders) need accurate geologic data with which to make informed decisions. The Leadville North quadrangle is designed to meet this requirement. The map is also part of the National Geologic Database, which is intended as digital framework for the entire country. From a scientific standpoint, the map clarifies many structural and lithologic relationships at the northern end of the Upper Arkansas River Valley, showing relationships between Laramide contractional faults and Rio Grande rift extensional faults. Tectono-magmatic relationships are also shown with the four ages of intrusive rocks. Cosmogenic nuclide data provides absolute age constraints on late Pleistocene deposits for further geomorphic and seismotectonic studies.

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DOI doi:10.5066/F7DR2TRG

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