Definition of Niagara period
Ni`ag´a`ra pe´ri`od
1.
(Geol.)
A
subdivision
or
the
American
Upper
Silurian
system
,
embracing
the
Medina
,
Clinton
,
and
Niagara
epoch
.
The
rocks
of
the
Niagara
epoch
,
mostly
limestones
,
are
extensively
distributed
,
and
at
Niagara
Falls
consist
of
about
eighty
feet
of
shale
supporting
a
greater
thickness
of
limestone
,
which
is
gradually
undermined
by
the
removal
of
the
shale
.
See
Chart
of
Geology
.
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niacinamide
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