51 



strata in this fault, is about four feet*, and the thrust plane 

 passes obliquely upward from right to left. The upper 

 strata, /. e. the Genesee, which, with the Hamilton beds are 

 alone involved, are flexed and broken, some portions stand- 

 ing on end, the whole having the appearance of a mono- 

 elinal fold. The Moscow shales are much fractured alone 

 the shearing plane, and present the characteristic features of 

 the "crushed zone" of such displacements. The Encrinal 

 limestone is completely broken, the right hand portion being- 

 raised four feet above the left hand portion. Professor Hall 

 who described and figured this fault!', found striae on the 

 faces of one of the oblique fissures, a feature not unusual in 

 such displacements. (See Plate XVI. ). 



The crushed zone has afforded a suitable avenue of escape 

 for the sulphuretted waters from the Genesee shale, and the 

 odor of the sulphuretted hydrogen is very strong near the 

 fault, while deposits of sulphur are not uncommon on the 

 face of the cliff. 



Just before reaching the " uplift " the Encrinal limestone 

 descends almost to water level. Beyond the uplift it quickly 

 returns to this level, forming a floor of rock for some 

 distance along the shore, and finally dipping below the 

 water. The coral layer of the lower Moscow shale appears 

 to advantage in this portion of the cliff, numerous large 

 cyathophylloids characterizing it. 



From the uplift, to Pike Creek, the bank is low, scarcely 

 rising above thirty feet, and is made up of the Moscow and 

 Genesee shales. At Pike Creek less than half of the Moscow 

 shales is exposed, their final disappearance below the lake 

 level occurring about a quarter of a mile beyond the mouth 

 of that creek. 



The mouth of Pike Creek presents an interesting feature, 

 due to the combined wave and stream erosion. The opening 



*Hal1, Rep't 4th Geol. Dist., 1893, p. 295. 

 tLoc. cit., p. 295, fig. 141. 



