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210
The Fairy-Land of Science
·
Arabella B. Buckley
164
Week
24
The
next
thing
we
have
to
account
for
is
the
bed
of
shale
or
hardened
clay
covering
over
the
coal.
Now
we
know
that
from
time
to
time
land
has
gone
slowly
up
and
down
on
our
globe
so
as
in
some
places
to
carry
the
dry
ground
under
the
sea,
and
in
others
to
raise
the
sea-bed
above
the
water.
Let
us
suppose,
then,
that
the
great
Dismal
Swamp
was
gradually
to
sink
down
so
that
the
sea
washed
over
it
and
killed
the
reeds
and
shrubs.
Then
the
streams
from
the
west
would
not
be
sifted
any
longer
but
would
bring
down
mud,
and
leave
it,
as
in
the
delta
of
the
Nile
or
Mississippi,
to
make
a
layer
over
the
dead
plants.
You
will
easily
understand
that
this
mud
would
have
many
pieces
of
dead
trees
and
plants
in
it,
which
were
stifled
and
died
as
it
covered
them
over;
and
thus
the
remains
would
be
preserved
like
those
which
we
find
now
in
the
roof
of
the
coal-galleries.
But
still
there
are
the
thick
sandstones
in
the
coal-mine
to
be
explained.
How
did
they
come
there?
To
explain
them,
we
must
suppose
that
the
ground
went
on
sinking
till
the
sea
covered
the
whole
place
where
once
the
swamp
had
been,
and
then
sea-sand
would
be
thrown
down
over
the
clay
and
gradually
pressed
down
by
the
weight
of
new
sand
above,
till
it
formed
solid
sandstone
and
our
coal-bed
became
buried
deeper
and
deeper
in
the
earth.
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