ALBION MORAINE. 703 



RANGE IN ALTITUDE. 



The altitude of the crest of the moraine is only about 540 feet at the 

 Erie Canal west of Knowlesville, while the altitude of knolls farther west in 

 the northern part of the Medina quadrangle is from 540 to 550 feet. The 

 altitude g-radually increases eastward, the 600-foot contour being reached 

 in the western part of Albion Township and the 620-foot contour 2 miles 

 southwest of Albion. The cemetery hill east of Albion rises above the 

 680-foot contour, but neighboring portions of the crest are scarcely 640 

 feet, and it stands near the 640-foot contour for several miles to the east. 

 About 3 miles southwest of Brockport the crest rises above the 660-foot 

 contour, and immediately south of the village it passes the 680-foot con- 

 tour. A knoll here appears, which rises above the 720-foot contour, but 

 the general elevation for a mile is about 680 feet. Between Brockport and 

 Spencerport the altitude decreases to about 600 feet, and from that village 

 southeastward into Gates Township only the prominent knolls rise above 

 that contour. At the crossing of the main line of the New York Central 

 Railroad southwest of Gates it is barely 580 feet, and few points from 

 there eastward to the Buffalo, Rochester and Pittsburg Railroad rise to this 

 contour, while at the bkiffs of the Genesee the altitude is only about 560 

 feet, and from the river southward to Ridgeland it is between 560 and 580 

 feet. The Pinnacle Hills ridge varies greatly in altitude, its northeastei'n 

 end at Brighton being barely 500 feet, while the highest point rises above 

 the 740-foot contour. Much of the crest stands above the 600-foot contour. 



Between Albion and Brockport, where the crest of the moraine is 

 highest, morainic knolls and ridges abound along the face of the Niagara 

 escarpment down about to the level of the Erie Canal, 510 feet, but are 

 rare north of the canal except in the spur near Adams Basin, where they 

 extend about 2 miles north of the canal. The highest points on this spur 

 are about 560 feet and the lowest about 460 feet. 



TOPOGRAPHr. 



The main ridge throughout much of its course has an abrupt outer 

 border relief of 20 to 30 feet, and is more nearly continuous than any 

 ridges in neighboring moraines. There are, aside from tlie lai-ge knolls 

 which occasionally appear along the crest, numerous small knolls and gentle 

 swells along the crest and on the slopes. The knolls and ridg-es which lie 



