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For more information, contact Andrei Sarna-Wojcicki. Strontium Geochronology - With modern isotope separation equipment, the content of selected elemental isotopes can now be measured in concentrations to parts-per-million to parts-per-billion and beyond.

The Sr geochronology method involves extracting these isotopes from fossil shell material (only several milligrams of sample are necessary for X-ray fluorescence spectroscopy).

The USGS maintains a tephrochronology laboratory in Menlo Park, CA.

In addition to the chemical and physical characteristics of volcanic ash, select igneous minerals in the ash can be used for absolute dating (discussed below).

Great volcanic eruptions in the Western United States in the geologic past produced airfall deposits that have been recognized as far away as the East Coast.This web page provides an overview of selected geochronology methods used by USGS scientists.New dating methods are invented all the time, however, most have practical limitations. Selector .selector_input_interaction .selector_input. Selector .selector_input_interaction .selector_spinner. Geochronology is the science of dating and determining the time sequence of events in the history of the Earth.

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