Geology of Sekeca County. 79 



The distribution of the till is rather irregular. The presence of 

 drumlins in the northern part does not, however, imply a ^reat 

 excess of deposit. Their materials, equally distributed, would 

 not produce a layer more than 10 feet thick over the surface of 

 Junius and Tyre. This must be added to a considerably greater 

 amount in the form of a sheet, which may be ^0 feet thick on the 

 average. 



The Seneca lake section has a very thin deposit for most of the 

 distance; thick drift occurs only in the depressions, described 

 under the head of Topography. On Cayuga lake, in the towns 

 of Fayette and Yarick, the rock is concealed by heavy deposits. 

 The eastern shore of the lake shows rock exposures much more 

 freely. The agreement in this respect between the lower part of 

 Seneca and Cayuga lakes is quite worth notice ; it is necessary 

 in both cases to go inland a long distance on the west shore to 

 find exposures, while the east shore is cliff -lined. 



The presence of a large amount of drift in the high land south 

 and south-east of Ovid village has been noted as an obstacle to 

 quarrying. 



The process of the formation of till is well illustrated in sec- 

 tions at the side of the Lehigh Yalley railroad, south of Willard. 

 The cut passes through a bed of shale, five feet thick at most and 

 600 feet long, on which lies a confused mass of blocks of the 

 same shale, piled up to the thickness of five feet, the blocks measur- 

 ing up to three or four feet in size, wedged together in all posi- 

 tions. Over all is a layer of two or three feet of common till. 



Glacial Striation. 



The following unpublished notes, though few in number, may 

 properly be recorded here : 



Top of hill north of Prospect hill, three miles from county 

 line ; slab of sandstone 25 feet long covered ; N. 40° W. 



Steep lake ward slope,, north of Lodi station, SiO feet above 

 lake, sandstone in roadside, E". 20° E. 



Beach opposite Geneva, Marcellus shale freshly stripped of till, 

 1,000 feet south of the outlet ; N. 45° E. 



Directly north of outlet, freshly uncovered Marcellus shale, 

 N. 40-50° E. 



