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From YouTube: Gravel hunters by Sedgwick Museum
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Metamorphic
rocks
they've
been
changed,
maybe
they've
been
squeezed
or
pressed
or
baked
like
in
an
oven,
and
we
don't
often
find
fossils
in
those
rocks
because
they're
often
destroyed
sedimentary
rocks
are
made
from
sediment.
That
means
things
like
mud
or
sand
grains
and
those
are
really
good
place
to
find
fossils
in
that
type
of
rock
so
to
become
a
fossil.
A
plant
or
an
animal
needs
to
be
covered
up
quickly,
so
it
doesn't
get
destroyed
or
eaten.
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So
where
can
we
find
these
rocks?
Well,
I'm
going
to
tell
you
about
a
rock
that
you
might
have
passed
by
and
not
even
noticed
this
flint,
gravel
and
you'll
be
able
to
recognize
it,
because
it's
kind
of
brown
and
about
two
centimeters
across
flint
is
a
particular
type
of
sedimentary
rock.
It's
made
from
silica
the
mineral
silica.
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So
humans
have
used
flint
for
all
sorts
of
things
and
you
might
have
heard
of
stone
age
people
using
big
pieces
of
flint
to
make
tools
with
today.
You
might
find
flint
gravel
like
this
on
driveways
or
in
a
car
park
like
this.
So
I've
got
a
team
of
helpers
today
and
we're
going
to
see
what
fossils
we
can
find
in
this
gravel
car
park.
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Something
that's
quite
common
in
the
flint,
gravel,
graffia
or
devil's
toenails,
like
these.
A
good
way
to
recognize
them
is
the
layers,
so
you'll
see
that
they're
made
up
of
these
little
layers.
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The
fossils
you
find
in
the
gravel
have
been
carried
great
distances
by
glaciers,
so
they're
often
worn
and
broken.
I've
shown
you
a
few
that
we
found
and
how
to
recognize
them.
If
you
want
to
find
out
a
bit
more,
have
a
look
at
our
gravel
hunters
worksheet
and
that
will
show
you
how
to
recognize
shell,
imprints
sea
urchins,
bellum,
knights,
sponges
and
if
you're,
really
lucky,
you
might
find
some
crinoids.