#ee 
462 J. LeConte—Formation of the 
tal crushing together and folding of the strata, and an up- 
swelling of the whole mass. Halland Hunt leave the sediments 
just after the whole preparation has been made, but before the 
actual mountain formation has taken place; and, therefore, In 
the language of Dana, “it is a theory of mountains with the 
mountains left out.” | 
fe Be Ege thes 
alae the elevation, would itself produce the plication ? Or 
Oo ro 
beyond : mast produced by horizontal thrust crushing 
such as ridges, peaks, gorges, and, in fact, nearly all that con- 
stitutes scenery, are produced by subsequent erosion. 
I feel considerable confidence in the substantial trath of the 
foregoing statement of the mode of formation of mountam 
chains. As to the mode of formation of continents and sea bot- 
be formed by a similar unequal yielding to horizontal thrust 
and a similar crushing together and up-swelling. If 80, be 
would be necessary to suppose the amount of horizontal yiela- 
__ ing in this case much less, but the depth effected much greatel) 
than in the case of mountain chains. But, as we find nour 
_ * Mountain Building, &., p. 106. 
