Dating techniques in geomorphology
In Menlo Park, contact: Dwayne Champion for more information about the paleomagnetic lab.Tephrochronology is the study of volcanic ash deposits.
Paleontologists frequently work in conjunction with other scientists utilizing any number of other geochronology methods.Geologic research and mapping requires the determinations of the ages and composition of rocks.A geologic map or report typically is only a summary of investigations that frequently involve the collecting and processing of hundreds of rock samples, followed by the evaluation and interpretation of data from a variety of analytical techniques.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).
This web page provides an overview of selected geochronology methods used by USGS scientists.