REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1902 r9 



gravel, and sand bordering the river and its tributaries to obtain 

 further light on the nature of the water body in which the 

 deposits were laid down and its relation to the retreating ice 

 sheet. From this district he proceeded to Lake George to 

 make a reconnaissance of the middle portion of that lake val- 

 ley. On July 2 he proceeded to the Mooers quadrangle and 

 began a detailed examination of the glacial deposits and the 

 subsequently formed shore lines of that area. Two months 

 were givn to this examination, including a side trip to the 

 reported shore lines of St Albans Vt., and a few days spent in 

 *he study of the postglacial scourways and gorge known as 

 " The Gulf " in the vicinity of Covey Hill, Canada. On the com- 

 pletion of this map, he proceeded westward along the northern 

 base of the Adirondacks, seeking for, and determining by 

 means of the aneroid barometer, the elevation of the shore 

 lines and deltas, in order to ascertain the extent and nature 

 of the related water levels in the Champlain area. This exten- 

 sion of the investigation into the St Lawrence valley was made 

 after a conference held at Washington, in February 1902, with 

 Mr G. K. Gilbert of the United States Geological Survey, who 

 kindly gave to the State Museum the use of his notes on that 

 area. Before leaving the field Professor Woodworth extended 

 his reconnaissance as far as Ogdensburg. 



Of the definite results obtained by him during the past sum- 

 mer, the most important was the determination of shore lines 

 marked by bars, embankments, or cut-shore terraces on the 

 Mooers quadrangle at various elevations between 280 feet and 

 495 feet, again at 500, 530, 540, 580, 610, 620, 630, 640 and 720 

 feet. Those above 580 feet do not continue about the northern 

 flank of Covey Hill and hence are regarded as interrupted by 

 an ice dam in that direction and interpreted as made in a 

 glacial lake or lakes. The highest well formed beach at Covey 

 Hill lies at 450 feet; if the terraces lying above this level to 580 

 feet are interpreted as stream-made by waters flowing between 

 the retreating ice and the till-covered slope of the hill, the 

 upper marine limit on the northern border of the Adirondack 

 mass at a point about 2 miles north of the international bound- 



