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Zircon U-Pb data for volcanic ash beds in the Barstow Formation, California...
Zircon grains separated from altered ash beds were analyzed to better understand the ages of beds. Isotopic analyses for U-Pb geochronology and trace element geochemistry were... -
Database for the geologic map of the central San Juan caldera cluster,...
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... -
Geology of the Grandfather Mountain Window and Vicinity, North Carolina and Tennessee
The Blue Ridge belt in northwestern North Carolina and northeastern Tennessee is composed chiefly of 1,000-million to 1,100-million-year-old metamorphic and plutonic rocks that... -
Geologic Map of the Charlotte 1 degree × 2 degrees Quadrangle, North...
The geodatabase for the Charlotte 1 degree × 2 degrees quadrangle by Goldsmith and others (1988) was compiled in the Geologic Map Schema (GeMS). The geologic map extends across... -
Digital database for the geologic map of the Vidal, California, and Parker...
This geologic database is a digitized version of the original 1:24,000-scale analog geologic map titled "Geologic map of the Vidal, California, and Parker SW, California-Arizona...