26 BULLETIN OF THE 



(9.) Channel of same brook near bridge west of Mr. Salmon's 13 feet 



(10.) B. & A. R. R. cut near Mr. Oscar Smith's (at least) 26 " 



(11.) B. & A. R. R. cut I m. X. E. of Richmond station (at least) 20 " 



(12.) Channel of brook in ravine ^ m. N. N. W. of Mr. Cook's in the 



Cook Valley H " 



(13.) Channel of brook at road crossing one mile N. E. of Mr. Cook's 



(at least) 6 " 



(14.) Channel of brook § m. west of summit of Prospect Hill 4 " 



5. DESCRIPTION OF THE BOULDER PHENOMENA. 



QUARTZITE BOULDERS. 



On the western slope of the Canaan and Lebanon Eange are many 

 boulders of gray and green quartzite, those of the latter color predomi- 

 nating. These boulders are without definite arrangement, have suf- 

 fered little abrasion, and do not exceed two feet in diameter. The 

 probable origin of the green quartzite boulders is Snake Hill, an emi- 

 nence situated about seven miles northwest of Fry's Hill, in the south- 

 east corner of the town of Nassau, N. Y. (See map of the Wyomanock 

 Valley.) Between Fry's Hill and Snake Hill the bed-rock consists of 

 mica schist, a fine-grained, flaggy sandstone of a gray color, and a red 

 shaly sandstone ; Snake Hill itself, consists of green quartzite, showing 

 no signs of stratification. 



The eastern declivity of Snake Hill is very precipitous, and at its base 

 the ground is almost entirely covered with large angular blocks of 

 quartzite like that of which the hill is composed. Going east and south- 

 east from this locality, many of these angular blocks are seen scattered 

 irregularly over the surface, and having a length of from one to five feet. 

 One fourth of a mile south of Wheeler's Hotel, East Nassau, the main 

 road passes between two angular masses of rock, which have each a 

 length and height of 15 feet, being sitxmted one foiu-th of a mile south- 

 east of Snake Hill. Half a mile to the east and southeast an alhivial 

 plain begins, and stretches east southeasterly up the valley of the Wyo- 

 manock Creek as far as New Lebanon. 



From the vicinity of the large blocks just mentioned, down to the 

 edge of the plain, the quartzite boulders are scattered quite thickly. 

 The plain itself, however, is entirely destitute of them, but in the bed 

 of the creek they occur in a number of spots in great abundance ; they 

 are to be found also on the hills along the northern border of the plain, 

 on the hills at its eastern end, and on the Canaan and Lebanon Range 



