6$ 



the secondary strata ; those now under review be- 

 ing purposely unnoticed at present. Whether or 

 not they were left in that manner at their forma- 

 tion, does not affect the question now under con- 

 sideration ; but it is ascertained that the surface 

 bears marks of waste, in consequence of which, 

 portions of the superficial rocks have been re- 

 moved. More particularly, it is known, that the 

 secondary rocks, as being the uppermost, have 

 been in the greatest degree subjected to these 

 changes. 



It is evident now, that if an universal deposit 

 of rock were to occur on such a surface, it must 

 be in contact with every member of the two 

 classes. It is equally evident, that if it were one 

 of the characters of such a rock to penetrate into 

 vacuities among those to which it succeeded, it 

 would be found intermixed with them in the 

 shape of veins, or in that of masses of other forms, 

 according to previous, or concomitant circum- 

 stances. Thus the unstratified rocks posterior to 

 the secondary strata, would not necessarily and 

 exclusively be connected with these. Even their 

 predominant connections would be regulated by 



