Essay on the Transition Rocks of the Cataraqui. S 1 



was laid on it. What long periods may therefore have elapsed in 

 time whilst the transition limestone of the Cataraqui obtained its 

 present magnitude. 



6 ft. — soil and debris. 



10 in. 



2 ft. 



1ft. 10 in. 



This vast bed is extremely solid and hard, as indeed are 



5 ft. J all the rest, excepting two or three at the bottom, which are 



6 in. 1 of a lighter color and softer; some near the top have a very 

 thin layer of clayey earth interposed. 



All these strata appear to be nearly 

 ^horizontal, at least, they follow the usual 

 tendency of the Cataraqui limestone. 



This section reaches to about tvs?o or three feet below the level of 

 the lake. No appearance of shells or organic remains was observa- 

 ble in cutting it, and if it had been necessary to have carried it a 

 little deeper, it would most probably have laid bare the subjacent 

 granitic aggregate. 



Vol. XX.~No. 1. 11 



