702 GLACIAL FORMATIONS OF ERIE AND OHIO BASINS. 



knolls as far as the west border of Murray Township, 2 miles. It is then 

 vague for about a mile, but reappears on the brow of the Niagara escarp- 

 ment near a schoolhouse. About one-fourth mile east of the schoolhouse a 

 gap about one-fourth mile wide sets in, but this gap is bridged by a reef of 

 bowlders. East of this gap for about 2 miles the ridge- lies just south 

 of an east-west road and is verj^ sharp and narrow. 



About IJ miles west of Holley the moraine makes a southward jog to 

 Clarendon, and thence passes in a nearl}^ east course into Monroe County. 

 In this deflection it passes around an esker that lies between Holley and 

 Clarendon. 



The moraine becomes more complex on passing east from Clarendon, 

 its ridges and knolls being scattered over a belt 1 to 2 miles wide, lying 

 mainly south of the Erie Canal. The main ridge, however, is along the 

 southern border, and is, as a rule, definite and nearly continuous. It passes 

 through Lake View Cemetery, IJ miles south of Brockport. There are 

 drift knolls and ridges in Brockport and eastward from there to Spencer- 

 port in sufficient number to give a morainic aspect to the surface. 



From Adams Basin, 2 miles west of Spencerport, a morainic spur 

 extends north nearly 2 miles, occupying a width of about a mile, but the 

 moraine presents a definite east-west ridge opposite the south end of this 

 spur, which passes about one-half mile south of Adams Basin and Spencer- 

 port. There are drift knolls around Spencerport and for a mile or more 

 east and north, but the moraine takes a southeastward course into Gates 

 Township, its crest passing just south of West Grates and crossing the main 

 line of the New York Central Railroad a mile southwest of Gates. It con- 

 tinues south of east to the Genesee River in the south part of Rochester, 

 upon crossing which it connects directl}' with the west end of the Pinnacle 

 Hills ridge. 



The Pinnacle Hills ridge is thought by Fairchild to be a marginal 

 moraine, but to the writer it appears more like a spur extending back from 

 the inner border of the moraine. A low till ridge, which leads from its 

 western end southwai'd toward Ridgeland, is thought to mark the continua- 

 tion of the Albion moraine. As this lies beyond the field allotted for inves- 

 tigation, its course was not traced farther than Ridgeland. The relation of 

 striae to this ridge is discussed farther on (p. 709). 



