Last Updated：2025/12/19
Sentence
In
North
America
the
millstone
grit,
and
a
grey
sandy
and
slaty
rock
beneath
it,
occur
three
times;
and
it
is
exceedingly
difficult
to
distinguish
these
rocks
in
hand
specimens,
without
the
aid
of
organized
remains.
And
remains
are
almost
exclusively
confined
to
the
grey
rocks.
Common
quarrymen,
farmers,
and
foreign
geologists,
apply
the
names,
greywracke
and
millstone,
to
all
these
rocks
promiscuously;
neither
having
observed
their
different
relative
positions.
Quizzes for review
In North America the millstone grit, and a grey sandy and slaty rock beneath it, occur three times; and it is exceedingly difficult to distinguish these rocks in hand specimens, without the aid of organized remains. And remains are almost exclusively confined to the grey rocks. Common quarrymen, farmers, and foreign geologists, apply the names, greywracke and millstone, to all these rocks promiscuously; neither having observed their different relative positions.
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