58 NEW YORK STATE MUSEUM 



shore has much stronger development of bars than the Iroquois. 

 The heavy representation on the map of the lower, Franklin 

 Center, series is somewhat misleading, as these bars are only gentle 

 •rolls or swells on the plains away from the stream deltas. Near 

 North Burke, however, is a kame-moraine which has been shaped 

 into bold ridges. Two views of the Chateaugay delta in Lake 

 Iroquois are given in plates 23 and 24. 



Malone quadrangle. The shore lines and deltas are well shown 

 on the map, and do not require much description. The lower 

 marine deltas lie in position to represent the Franklin Center shore. 

 Below this broad sand and silt plains extend down the Trout and 

 Salmon rivers to Canada ; but are not colored on the map. 



The head of the Salmon river delta in Lake Iroquois is repre- 

 sented in boulder masses some 7 miles up the river ravine at 

 Chasm falls. Remnants of the delta are seen south of Malone in 

 the reservoir and other gravel hills, but the vigorous Post-Iroquois 

 erosion has swept away most of the Iroquois delta and redeposited 

 it downstream at the sea level, making the massive sand plain north 

 of Malone. 



On this sheet no attempt has been made to map beaches below 

 the marine summit. The marine shore lies across the southeast 

 corner of the Moira quadrangle, which is not included among the 

 maps of this writing. The most conspicuous feature on the Moira 

 quadrangle is a strong shore south of Brushton and Moira and 

 passing through Lawrenceville, in the approximate position of the 

 Franklin Center shore line. So far as observed, this is the last 

 clear representation of that lower shore, going to the southwest. 



The area south of the Moira and east of the Potsdam quad- 

 rangles has not been mapped, but the shores lie across the north- 

 west corner of this unnamed sheet in strong shape. The Iroquois 

 delta on the Deer river is at Dickinson Center; and on the east 

 branch St Regis, at Nicholville. Northwest of Dickinson Center 

 are good summit bars of Iroquois, and one and one-half miles 

 southeast of Nicholville are strong boulder bars, lying obliquely 

 across the road with moraine surface behind them. This will 

 give a good figure for the Iroquois shore when the topographic 

 survey is made. The marine plane is shown by bars and delta at 

 Fort Jackson, on the St Regis river, east branch. 



Potsdam quadrangle. This quadrangle has been examined with 

 care, and with the assistance of Prof. George H. Chadwick. Two 

 large rivers cross the area, the west branch of the St Regis, and 

 the Raquette, and they have left heavy deltas at the Iroquois and 



