IO NEW YORK STATE MUSEUM 



region is marked by a small lake, Lake Bonita, which occupies a 

 rock depression at the elevation of 860 feet. Its drainage is north- 

 ward to the Hudson river. The highlands are deeply trenched, in 

 the northeastern portion of the quadrangle, by the Hudson river 

 which at Corinth turns abruptly eastward in its course and after 

 several sharp bends emerges from the mountainous district upon 

 the Hudson Valley plain in the tract' near Glens Falls. As stated by 

 Wright 1 and Miller, 2 this portion of the Hudson valley has been 

 formed since preglacial times. The conditions and factors which 

 determined its origin and development will be discussed later in 

 this report. 



The second region of highlands occupies the northwestern por- 

 tion of the sheet extending southward as far as East Galway. It 

 belongs to the general territory of the Adirondacks and possesses 

 the typical physical features of the low mountainous portion of the 

 Adirondack country. The general elevation approaches 2000 feet, 

 the highest point being 2025 feet. From the mountain crests the 

 country falls off sharply to the east, forming a steep slope facing 

 the central basin described below. Beyond the crests to the west 

 the region has somewhat the character of a mountainous plateau, 

 broken by hills and depressions. Many of the latter are occupied 

 by small lakes or swamps. The drainage of this portion of the 

 area is toward the west, the creeks ultimately discharging into the 

 Sacandaga river. This region is sparsely populated or unin- 

 habited, the soil being generally untilled and oovered with second- 

 growth forests. 



Lying between the two highlands regions is a broad basin under- 

 laid by stratified rocks of the lower Paleozoic series. This basin is 

 continuous with the general valley of the Hudson north of Corinth 

 and is evidently identical with the latter in geological origin. The 

 rock floor of this erosion channel is now generally covered with de- 

 posits of glacial age and the exact course of the preglacial stream, 

 heading in the upper Hudson valley, can not be traced southward 

 beyond Corinth. The topography of the basin itself becomes ob- 

 scured by heavy drift toward the south and becomes entirely lost 

 in the southern portion of the sheet. 



The general level of the bottom of the basin may be stated as 600 

 feet. A low divide occurs near South Corinth, the elevation here 

 being 636 feet. The principal drainage stream of the Saratoga 



1 Science, November 22, 1895, p. 675. 



2 Bulletin of the Geol. Soc. of America, 22:185. 



