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This
USGS
site
explains
what
an
aquifer
is
and
defines
the
different
types
of
aquifers
based
on
six
principal
lithologies;
sandstone,
carbonate,
sandstone-carbonate,
igneous
and
metamorphic,
sand
and
gravel,
and
other
rock
types.
The
site
features
maps
and
descriptions
of
the
major
aquifers
in
the
United
States
as
well
as
general
information
about
groundwater
occurrence
and
quality.
The
site
also
...
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