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1859
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1859
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time 1859 1860 1861 1866 1869
length of time 1872

elsewhere 1859 1860 1861 1866 1869
which are elsewhere 1872

chanced to have 1859 1860 1861 1866 1869
OMIT 1872

So that if such species 1859 1860 1861
So that, if such species 1866 1869
Consequently if it 1872

any 1859 1860 1861 1866 1869
the deposition of any 1872

Nor will the closest inspection of a formation give
us any
any
idea of the time which its deposition
may have
has
consumed. Many instances could be given of beds only a few feet in thickness, representing formations, elsewhere thousands of feet in thickness, and which must have required an enormous period for their accumulation; yet no one ignorant of this fact would have
even suspected
suspected
the vast lapse of time represented by the thinner formation. Many cases could be given of the lower beds of a formation having been upraised, denuded, submerged, and then re-covered by the upper beds of the same formation,— facts, showing what wide, yet easily overlooked, intervals have occurred in its accumulation. In other cases we have the plainest evidence in great fossilised trees, still standing upright as they grew, of many long intervals of time and changes of level during the process of deposition, which would
not
never even
have been
sus- pected,
suspected,
had not the trees chanced to have been preserved:
thus,
thus
Sir C.
Messrs.
Lyell and
Dr. Dawson
Dawson
found carboniferous beds 1400 feet thick in Nova Scotia, with ancient root-bearing strata, one above the
other
other,
at no less than sixty-eight different levels. Hence, when the same species
occurs
occur
at the bottom, middle, and top of a formation, the probability is that
it has
they have
not lived on the same spot during the whole period of deposition, but
has
have
disappeared and reappeared, perhaps many times, during the same geological period. So that if such species were to undergo a considerable amount of modification during any one geological
formation,
period,
a section would not
probably
probably
include all the fine intermediate gradations which must on
our
my
theory have
existed,
existed
between them,
between them,
but abrupt, though perhaps
very
....
slight, changes of form.
It is all-important to remember that naturalists have