202 E.xrKDITlON TO TUE 



ments or tatters, and constitutes the remains of a formation, 

 which probably covered the whole of the limestone, at 

 least in this part of the country. That it is above the lime- 

 stone, no doubt can exist, in our minds, as we saw the imme- 

 diate superposition. It sometimes appears, it is true, to sink 

 below the level of that rock; and this led us at first to ap- 

 prehend that there might be an alternation of strata, but a 

 careful examination of all these spots has left no doubt in 

 our minds, that in these cases the sandstone is deposited in 

 coves or valleys formed in the limestone previous to the 

 deposition of the sandstone ; these cases are, however, not 

 common, and we may safely state, as a general rule, that 

 not only the sandstone is relatively above the limestone, but 

 that it is even, in almost all cases, at a greater absolute ele- 

 vation ; and the spot, at which we first met with it, west of 

 the Wassemon, was considerably elevated above the usual 

 level of the limestone ; for, wherever the sandstone has re- 

 tained its position, it has protected the limestone against 

 decomposition, and hence, in such places, the latter rock 

 still continues to rise to a higher level than where it is 

 laid bare, and exposed to the destructive influence of at- 

 mospherical agents. We also observed very distinctly, that 

 while the valleys, formed in the limestone at a time anterior 

 to the deposition of the sandstone, were few, those produced 

 subsequently were numerous, as was indicated by the great 

 roughness and unevenness of the sandstone country, and 

 by the many undulations in the uncovered limestone 

 which we have already had occasion to mention. From the 

 observations made on the 18th, it was thought very probable 

 that all the hills observed at a distance on the 17th, were 

 formed of this sandstone ; and from some characters which 

 had appeared, at the time, to present an anomaly, it was in- 

 ferred that the Enneshoteno or twin mountains, near which 



