J. D. Dana on a Mohawk-valley Glacier. 249 
On the Catskills, the glacier scratches reach to a height of at 
least 2235 feet—the elevation at the Mountain House, and this 
“9 country through erosion, during the time which has since 
elapsed, still further enhance these difficulties. But, whatever 
t 
teen Mountains and the Catskills, to a Hudson-valley gla- 
in the vicinity of Penobscot Bay, recently 
arch, has conclu 
valley glacier may, with little if any doubt, be added to the 
number alre dy defined, and probably, also, a Susguehannah- 
valley glacie 
rs 
say states, in his observations on the drift-scratches of the Catskill region 
(Quart. Jour Geol. Soc. , 208), that while the striations on the ascent of the 
om the east were “nearly north-and-south alo of the escarp- 
ment, and not from east down the slope of the hill,” and “ very s' 
sequent up to the plateau on which ountain House stands, 2850 [2235] feet 
the - this summit level, on the watershed, the sera! te to 
west, s “on this plateau, numerous main grooves are seen, 
cross the hill, and seals P ‘les to most of those o ed the 
heeth—seemingly inting to the fact that the icebergs [Mr. ae oe 
reasoning the Lidvenethes which striated the eastern flank of ( 
in a north-and-south erage the whole was nearly submerged, here found a 
8reat escarpment that now faces the Hudson.” He states, also, that these main 
Brooves are crossed “at various angles” by “minor striations.” Mather, as men- 
(loned in his ical Report, made long since some similar observations on the 
Catskill scratches ; ut they were less complete than those by Ramsay. 
