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USGS - science for a changing world

U.S. Geological Survey



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As an unbiased, multi-disciplinary science organization that focuses on biology, geography, geology, geospatial information, and water, we are dedicated to the timely, relevant, and impartial study of the landscape, our natural resources, and the natural hazards that threaten us.


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Rubidium-strontium analysis
Technique for dating ancient rocks based on measuring the ratio of the isotopes strontium-87 to ribidium-87 in samples. Uses the known half-life of radioactive isotopes of rubidium-87 that decay to isotopes of strontium-87 to determine rock ages.

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Hot Creek in the Long Valley Caldera, CA Landing in Hot Water—Literally
USGS scientists, along with colleagues at the U.S. Forest Service, have published a new fact sheet, "Boiling Water at Hot Creek—The Dangerous and Dynamic Thermal Springs in California's Long Valley Caldera."  Learn More
 
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The Native American or "Indian style" jewelry with turquoise mounted in or with silver is relatively new. Some believe this style of Jewelry was unknown until about 1880. Prior to this time, the Native Americans made solid turquoise beads, carvings, and inlaid mosaics.
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