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Geochronology
Study of the age of the earth by dating geological formations, rocks, and fossils.
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Results 1 - 6 of 6 listed by similarity [list alphabetically]
Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan mountains, Colorado [New Window]
New age determinations with descriptions of sample locations and analytical details.
Isotopic ages of rocks in the northern Front Range, Colorado [New Window]
Maps, tables, and GIS data for isotopic ages determined in the northern part of the study area.
K/Ar ages of materials in the US [New Window]
A subset of the National Geochemical Database (as of 1995). Shows the distribution of published K/Ar and Ar/Ar age determinations in the US. Sample location, rock description, analytical data, age, interpretation, and bibliographic reference are given.
Mesozoic magmatism and base-metal mineralization in the Fortymile mining district, eastern Alaska--Initial results of petrographic, geochemical, and isotopic studies in the Mount Veta area [New Window]
Initial results of a petrographic, geochemical, and isotopic study of Mesozoic intrusive rocks and spatially associated Zn-Pb-Ag-Cu-Au prospects in the area.
Radiometric ages of rocks from Alaska [New Window]
Radiometric ages of rocks or minerals sampled from Alaska. The data were collected from professional publications and/or received from researchers and used by permission.
XLS Uranium-lead zircon ages and Sr, Nd, and Pb isotope geochemistry of selected plutonic rocks from western Idaho [New Window]
U-Pb geochronology and isotopic studies of select plutons across the Salmon River suture in western Idaho.

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