312 ON THE ELEVATED SUBMARINE ALLUVIA. 



ceive such an extensive elevation of rocks, without 

 an accompanying one of the unconsolidated materials 

 also, which chanced to he present. It is sufficient 

 however, to have suggested this possible case. 



I remarked, at the commencement of this chapter^ 

 that the deposits here discussed had been confounded 

 with the other recent or tertiary strata, Unques- 

 tionably, there is a similarity in the strata and in the 

 imbedded substances, even where it is demonstrable 

 that the former are the produce of aestuaries, or of 

 basins ; but it is one that is plainly necessary, under 

 whatever difference of circumstances they may re- 

 spectively have been produced. In both cases, they 

 could have been but the materials which are deposited 

 under sea water, and, in both, they must have con- 

 tained analogous animal remains. But it must be 

 evident, that, while those remains may present pecu- 

 liarities in the one situation, not existing in the other, 

 the alluvia under review occupy positions very dif- 

 ferent from those of any sestuary or lake that can be 

 imagined. It will yet however remain to be seen, 

 whether some, even of those, may not belong to this 

 division ; as I shall soon proceed to show that ana- 

 logous causes are required for the explanation of 

 many of those which occupy elevated positions. 



