Origin of Species Variorum

→ 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

....

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