100 RURAL NEW YORK 



ward around the foot and along the shores of the 

 Finger Lakes. Its relation to the heavier move- 

 ment of the glacial ice is indicated by its furthest 

 southward reach in the Cayuga-Seneca lakes section, 

 which is the center of the Finger Lakes trough. 

 Lower Seneca County has a larger development of 

 this series than any other county of the same lati- 

 tude, except perhaps Livingston, where the broad 

 valley of the Genesee Eiver similarly favored the 

 southern development of the series. Around the east- 

 ern end and on the south shore of Lake Erie, the 

 series is not much developed, partly because of the 

 abrupt slope to the highlands. To the eastward its 

 development is modified by the material from the 

 A.dirondacks. Its most northern occurrence is at the 

 east end of Lake Ontario in southeastern Jefferson 

 County, and in Central St. Lawrence County where 

 it is associated with the Trenton limestone. 



Standing close to the Ontario series, in character 

 but not in extent, is the Honeoye. This is closely 

 associated with the exposures of the limestone for- 

 mations in the same district in which the Ontario 

 series occurs. It represents that part of the till 

 region where limestone was most largely introduced 

 into the soil and where there is sufficient lime car- 

 bonate, even in the soil, to effervesce freely with 

 acid. The field stone are nearly all limestone. 

 The subsoil is filled with limestone fragments. 



The till mantle that forms the Honeoye series is 

 relatively thin and in the stony type limestone ledges 

 protrude in many places. Three types are common 



