BREACH OF ST. LAWRENCE NEAR QUEBEC. 391 



When this opening was made by the force of the in- 

 cluded water, the land was laid bare on both sides of 

 that river, as far up as St. Regis, including the islands of 

 Montreal and Jesus ; and by the same operation, the land 

 on both sides of lake Champlain would be drained as far 

 as Ticonderoga and Whitehall. The following fossil 

 relicks countenance this supposition. 



The specimens of pectinites and other marine animals 

 brought to me from the lime-quarries of Montreal, by 

 Professor Andrew Eliicot, of the United States' Military 

 Academy, at West-Point. 



Specimens of a like character, filled with marine ex- 

 uviae, from the strata of calcarious carbonate at St. Re- 

 gis, sent to me by the same gentleman. 



Ammonites from the vicinity of Plattsburgh r brought 

 by his excellency Governor Tompkins, incased and pre- 

 served limestone. 



Pectinites, Ammonites, Corals, and shells of various 

 kinds, observed by Bishop Kalm at Crown Point, and 

 other places along Lake Champlain. 



4 and 5. The breaches made by the Delaware and 

 Schuylkill rivers through the lower barrier. 



The alluvion at and near Philadelphia, ought to be 

 very considerable, since two rivers have concurred to 

 bring it down to its present location. In this respect, 

 the site of that beautiful city deserves to be compared 

 with that of New- York. Both stand upon an allu- 

 vial base; which rests upon a primitive bottom. Mr a 



