38 



The Upper Devonian strata ot thivS section include several 

 feet of the black Genesee shales, the gray Genesee shales, and 

 the Styliolina band. The Genesee shales are usnalK^ talus- 

 covered and overgrown with vegetation. The Styliolina 

 liinestone is somewhat more shaly in this section than in the 

 preceding ones, but as usual, projects some distance from the 

 bank. No good o]iportunit\' for the study of the Moscow 

 shales is afforded, for they are practically inaccessil)le. The 

 large cup corals which are common in the talus at the foot 

 of the section are all derived from the coral layer in the 

 lower Moscow shale. They may be seen in place by climbing 

 the bank in the little "corry " near the centre of the section. 

 The Encrinal limestone appears near the middle of the 

 section, forming a prominent band. It rises north-westward 

 at the average amount of one foot in sixty-three, giving an 

 approximate south-easterly dip of less than one degree to 

 the strata. 



On the Lake Shore road, at the descent to the bridge from 

 the north, the Encrinal limestone formerly caused a distinct 

 shelf or ridge, which extended across the road. The earlier 

 visitors to the Eighteen Mile Creek sections will remember 

 the distinct bump which the carriage or omnibus, which 

 brought them, experienced in passing over this rock. At the 

 present time the rock has either been taken out or covered 

 over, so that the characteristic bumj) is no longer ex- 

 perienced. 



Where the rocks first become exposed at the upper end of 

 the section, about sixteen feet of the Hamilton shales appear. 

 At the bridge, thirty to thirty-five feet of these .shales are 

 exposed, but the lower portion of the clift is covered bv talus. 

 The layer of concretions bearing the Athyris spiriieroides 

 (Eaton ), first noted in Section 6, appears throughout in this 

 section, remaining at the average distance of nine feet below 

 the Encrinal limestone. From its disintegration, the talus 

 at the foot of the clift is rich in this fossil, this being the best 

 locality for collecting it. Many specimens will be found 



