1 6 NEW YORK STATE MUSEUM 



valley was obliterated, having been rilled in with drift. At the 

 same time the newer topography exhibits a much greater variety in 

 minor features, due to the heaping of the deposits and the inter- 

 vening depressions. 



Mention may here be made of a remarkable boulder of which a 

 photograph and description by Cushing 1 is here reproduced : " We 

 can not leave Pleistocene matters without calling attention to one 

 detail, the impressive glacial boulder shown in plate i. It stands 

 on the summit of a low drumlin 3 miles due west from Saratoga 

 and is a conspicuous object. Viewed from a distance it looks like 

 a monument, a simple shaft. It consists of a huge slab of Little 

 Falls dolomite about 15 feet long, stood up on end. Some ex- 

 foliation has taken place, due to frost attacks, but on the whole it 

 has suffered comparatively little damage from the weather. For the 

 glacier to leave a block of such shape in such position in such 

 commanding situation is highly exceptional, and is one of the most 

 striking objects of the kind that we have had the privilege of be- 

 coming acquainted with." 



Drumlins. Many of the hills of till in the region just referred to 

 possess characteristically the forms and orientation of drumlins. 

 In the Greenfield locality they form conspicuous and imposing 

 features of the landscape. The largest of them are about three- 

 fourths of a mile in length and have an elevation, measured from 

 the immediate base, of about 100 feet. A considerable range of 

 forms as dependent upon ratio of width to length is exhibited. 

 Some are broadly oval; others, more typical, are about three times 

 as long as wide; a few are narrowly oval, approximating a ridge- 

 like form. Not all the drumlins have been indicated by color on 

 the map. Those designated possess a rather marked regularity of 

 form and some are noticeable for their strikingly smooth and evenly 

 carved outlines. In some of the hills it was determined by observa- 

 tion that the materials of which they are composed are of the 

 nature of till. 



Lake Albany deposits. The materials of the sand-plain region 

 in the southeastern quarter of the quadrangle vary in different 

 localities, as seen at the surface, from coarse sands to fine-grained 

 sands and clayey sands. There are sufficient exposures in section, 

 along creeks and in sand pits and excavations for highways, to 

 establish the stratified arrangement of the materials. They are 



1 Geology of Saratoga Springs and Vicinity, by H. P. Cushing and R. 

 Ruedemann. N. Y. State Mus. Bui. 169, p. 147. 



