428 Scientifie Intelligence. 
which is the admitted base of the Champlain division, but we have a 
ber of 
tinct from and older than that of the Potsdam sandstone, pa" 
absolutely nothing of the Taconic system which Dr. Emmons e - 
below the base of the Champlain division, that is to say, below the 
dam sandstone, If, however, as is probable, these slates con F the 
: from the Potsdam, they might be retained under the name ° 
* This Journal, May, 1861, p. 402. 
