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1859
1860
1861
1866
1869
1872

Compare with:
1861
1869
1872

in which it was formed; nor would 1866 1869 1872
supposed to be shallow; 1861

OMIT 1866 1869 1872
would not generally 1861

by atmospheric degradation and by the action of the sea during 1866 1869 1872
during 1861

a long period. 1866 1869 1872
an extremely long period,— a consideration which I formerly overlooked. 1861

also expresses his belief that 1866 1869 1872
in commenting on this subject, states that he believes the entire destruction of any 1861

rarely been completely destroyed. 1866 1869 1872
been of rare occurrence. 1861

rocks of this nature must 1866
these latter rocks 1869 1872

denuded on 1866 1869
stript of their covering to 1872

4 blocks not present in 1859 1860 1866 1869 1872; present in 1861
My remarks apply solely to beds rich in fossils: I have admitted that sediment accumulated in extremely thick, solid, or extensive masses would escape denudation. The point in question is, whether widely extended formations, rich in fossils, and of sufficient thickness to last for a long period, would be formed except during periods of subsidence? My impression is that this has rarely been the case. As the subject of complete denudation has been broached by Mr. Hopkins, I may remark that all geologists, excepting the few who believe that they see in the metamorphic schists and plutonic rocks the heated primordial nucleus of the globe, will probably admit that rocks of this nature must have been largely denuded.

whilst uncovered; 1866 1869 1872
in a naked condition; 1861

protecting mantle 1866
mantle 1861
protecting mantle of rock 1869 1872

such rocks as 1861 1866
OMIT 1869 1872

deposits. In the case of an extensive and shallow sea, such as that within a large part of the Malay Archipelago, where the depth varies from 30 or 40 to 60 fathoms, a widely extended formation might be formed during a period of
elevation
elevation,
and yet not suffer excessively from denudation during its slow upheaval; but the thickness of the formation could not be great, for owing to the elevatory movement it would be less than the
depth,
depth
in which it was formed; nor would the deposit OMIT be much consolidated, nor
would it
....
be capped by
over- lying
overlying
formations, so that it would run a good chance of being worn away by atmospheric degradation and by the action of the sea during subsequent oscillations of level. It
has
has,
been
however, been
suggested by Mr. Hopkins, that if one part of the area, after rising and before being denuded, subsided, the deposit formed during the rising movement, though not thick, might
become
afterwards become
protected by fresh accumulations, and thus be preserved for a long period.
Mr.
Hopkins,
Hopkins
also expresses his belief that sedimentary
bed
beds
of considerable horizontal extent
to
....
have rarely been completely destroyed. But all geologists, excepting the few who believe that our present metamorphic schists and plutonic rocks once formed the primordial nucleus of the globe, will
probably
probably
admit that rocks of this nature must have been denuded on an enormous
extent.
scale.
For it is scarcely possible that
such
these
rocks
should
could
have been solidified and crystallized whilst uncovered; but if the metamorphic action occurred at profound depths of the ocean, the former protecting mantle may not have been
thick.
very thick.
Admitting then that such rocks as gneiss, mica-schist, granite, diorite,
&c,
&c.,
were once necessarily covered up, how can we account for the
extensive
naked
and
naked
extensive
areas of such rocks in many parts of the world, except on the belief that they have subsequently been