REPORT OF THE DIRECTOR 1898 r91 



Darton, in his report on the geology of Ulster co.^ seems to con- 

 sider these as a part of the estuary deposits, but he probably did 

 not give them very careful consideration. 



The area which this lake occupied, if it did exist, is not a heavily 

 wooded one, and the detail could consequently be the more easily 

 worked out. The points to look for w^ould, of course, be the ex- 

 istence of any deltas at the mouths of streams entering this lake, 

 and possibly some trace of shore lines in the form of either wave^ 

 built or wave-cut terraces might be found. 



The estuary clays and overlying sands extend up the valley as far 

 as Rosendale, and even to Highfalls. There is a well marked 

 terrace area one mile west of Rosendale, at the point where Cox- 

 ingkill enters Rondout creek. The main estuary terrace, however, 

 extends up the valley of the Wallkill ; the country between Ron- 

 dout creek and the Wallkill, east and south of Rosendale, is underlain 

 by a broad terrace area. In the vicinity of Springtown, fa)-ther up 

 the valley, the western border of the terrace is not over an eighth 

 of a mile west of the railroad, while its eastern edge is fully a mile 

 or more to the east of Springtown. At New Paltz, the Wallkill 

 Yalley railroad follows the eastern edge, while the western is across 

 the valley about one mile distant. Southeast of JNew Paltz the 

 terrace can be traced as far as Libertyville, and a short distance 

 beyond. All of the sections between this point and Springtown 

 show an abundance of sand and very little clay, indicating that the 

 delta of the Wallkill was in this vicinity, and that most of the clay 

 was washed farther down toward the valley. There is some clay 

 just south of New Paltz, but it is quite sandy. 



1 Rep't N. Y. state geol. 1893. 1 : 369. 



