DATA CENTER
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Photo Gallery for Clarke County, Virginia
Clarke
County
Photo Gallery
Age Dating |
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FILE: age06.jpg |
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DESCRIPTION: |
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Collection of dissolved gas
sample. Samples are analyzed with a gas chromatograph at
the
USGS Reston Chlorofluorocarbon Laboratory in Reston, Va..
The analyses includes dissolved nitrogen, argon, methane, carbon
dioxide, and oxygen. The temperature of the water at the
time of recharge is determined by the concentrations of
dissolved nitrogen and argon. This recharge temperature is
used in the age-dating techniques. |
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SOURCE:
David Nelms
USGS |
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