314 BULLETIN 226. 



the stony material that now makes up the soil of the south part of the 

 county. This material was deposited in the long hills, or drumlins, and in 

 the sheet of stony material that occurs between them. The depth of this 

 covering of glacial drift varies from a few feet to about one hundred and 

 seventy-five feet. In many places between the hills the bed-rock is very 

 close to the surface, what soil there is having been largely brought from 

 the hills by the rains. In some places the bed-rock is still uncovered. 

 Many of the small streams that drain the area run on this rock. In order 

 to drain some of the lower land, the rock must be blasted out in order 

 to deepen the streams. 



The drumlin area. About two-thirds of the county is covered with a 

 succession -of the long north and south hills or drumlins. (See page 364.) 



FIG. 67. Near Sodus Bay. A sandy soil. This was formerly the old lake bed. 

 The hills in the foreground have been caused by subsequent erosion. 



These hills have a slightly northwest and southeast direction. They are 

 from one-fourth of a mile to three miles long usually a little over a 

 mile and are about one-fourth as wide as long. Their tops are from 

 450 to 670 feet above sea level, and rise from 75 to 175 feet above the 

 valleys. .These heights for such narrow hills give very steep east and 

 west slopes. The north and south slopes occupy comparatively little of 

 the area. The former are abrupt, the latter more gentle. The greater 

 part of the elevated land, therefore, consists of very steep east and west 

 slopes. The orchards are situated on these slopes and on some of the 

 rolling land of lower levels. The soil type of the hills and the higher 

 part of the lower land is the Miami stony loam. (See page 316.) 



The drumlin area that was once partly submerged. In the northeast 

 part of the county, east of Sodus Bay, there is a considerable area where 



