STRIDE IN THE GRAND RIVER LOBE. 467 



are scattered strife formed subsequently, which bear S. 2° to 10° W. The 

 rock surface dips southward; i. e., away from the advancing ice sheet. The 

 later stria,tiou and possibly the whole glaciation may be due in large part 

 to a sloughing of the ice from the quarry toward the valley, giving the 

 strige a more southerly course than the ice sheet had as a whole, for nearl}' 

 all the striae in the vicinity have a southeastward bearing. 



At the exposure 4 miles southeast of Greenville, near Salem Churcli, 

 where cross striae occur, a projecting point of the east bluff of the Shenango 

 River is glaciated. The glaciation where the Grreenville and Mercer road 

 crosses covers a part of the north slope, the crest, and considerable of the 

 south slope of this ridge-like point. On the north slope and crest the strici? 

 have a general southeasterly bearing, with variations of but a few degrees, 

 but on the south slope great divergence occurs. About 20 rods south of the 

 crest and 15 feet or so lower is an exposure in which the heavy glaciation 

 is S. 17° E. About 20 rods farther south is a glaciated surface which 

 descends southward with the slope of the hill, the descent being about 4 feet 

 in a distance of 40 to 50 feet. The strias vary from S. 8° to 50° E., the 

 earlier and heavier glaciation being nearly southeast. The later glaciation 

 varies from S. 8° to 35° E., and includes several large grooves. It consists 

 of scattering striae and grooves, with but little glacial planing, the earlier 

 glaciation being bu,t slightly effaced. The deflection toward the south on 

 the south slope of this point of land may have been influenced largely by 

 the lower land there. The absence of cross striae on the north slope and 

 crest seems to favor this idea. 



In the quarries 1^ miles southeast of Cortland, Ohio, where cross stnae 

 occur, there are two sets, an earlier, bearing S. 10° E., and a later, bearing 

 about S. 8° W. The earlier is a heavy glaciation with grooves several feet 

 long, the later a series of irregular gouges a few inches in length. This 

 quarry shows signs of disturbance, the blocks in it inclining toward the west 

 with a dip of several degrees. Wliether or not the disturbance occurred 

 while glaciation was going on, and whether, if it did take place at that time, 

 the change of dip caused the change of bearing, the writer was unable to 

 decide. 



In Bartholomew's quarry, southwest of Andover, Ohio, the heavier 

 glaciation is S. 25° E. The hghter glaciation, bearing S. 5° to S. 10° W., 

 consists of scattering grooves. The relative ages of these sets was not 

 determined, there being no place where both set^ occur on a single surface. 



