Jacobsville sandsone,
sedimentary
rock,
found
in
Sault
Ste.
Marie,
Ontario.
Late
Precambrian
or
early
Paleozoic
age
over
550
million
years
old.
The
sandstone
is
the
resistant
rock
which
forms
the
rapids
in
the
river
at
Sault
Ste.
Marie.
The
sandstone
red
colour
is
caused
by
ferrous
iron.
This
rock
and
the
rocks
in
Bachawana
Bay
could
be
of
late
Precambrian
or
Cambrian
age.
No
fossils
are
found
in
the
rocks
which
would
help
to
tie
down
their
age.
The
sandstones,
basaltic
lavas
and
conglomerates
have
not
been
metamorphosed
since
their
formation.
Sir
William
Logan,
the
first
Director
of
the
Geological
Survey
of
Canada
classified
these
rocks
as
being
Old
Red
Sandstone
age,
similar
to
the
ones
he
had
seen
in
Britain.
The
sandstone
shows
layering
formed
as
the
sand
was
deposited
in
a
river
delta.
The
jacobsville sandstone
is
used
as
a
building
stone.
