Origin of Species Variorum

→ supposed to be shallow; 1861

in which it was formed; nor would 1866 1869 1872

→ would not generally 1861

OMIT 1866 1869 1872

→ during 1861

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

→ an extremely long period,— a consideration which I formerly overlooked. 1861

a long period. 1866 1869 1872

→ in commenting on this subject, states that he believes the entire destruction of any 1861

also expresses his belief that 1866 1869 1872

→ been of rare occurrence. 1861

rarely been completely destroyed. 1866 1869 1872

↑ 1 blocks not present in 1859 1860 1861; present in 1866 1869 1872

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 admit that rocks of this nature must have been denuded on an enormous scale.

→ in a naked condition; 1861

whilst uncovered; 1866 1869 1872

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,

→supposed to be shallow; the deposit →would not generally be much consolidated, nor

~~would it~~

would it

be capped by

over- lying

overlying

formations, so that it would run a good chance of being worn away →during subsequent oscillations of level. It

has,

has

however, been

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

afterwards become

become

protected by fresh accumulations, and thus be preserved for →an extremely long period,— a consideration which I formerly overlooked.

Mr.

Hopkins

Hopkins,

→in commenting on this subject, states that he believes the entire destruction of any sedimentary

beds

bed

of considerable horizontal extent

have →been of rare occurrence. ↑ 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. For it is scarcely possible that

such

these

rocks

could

should

have been solidified and crystallized →in a naked condition; but if the metamorphic action occurred at