XXI. 



abutment of the stone railroad bridge (see Plate IV. ). The 

 stream can usually be crossed near the bridge, Avhere the 

 Styliolina limestone forms the bed of the stream. Taking 

 this stratum as the first datum plane, the overh-ing beds, 

 exposed in the section can be studied with reference to it. 

 The loose blocks in the bed of the stream will well repay 

 attention, and the shale outcrops between Sections 1 and 2 

 should not be overlooked. 



By following the map, the various sections can be ex- 

 amined, and the rocks studied in descending order. The 

 Styliolina bed will alwa^-s serve as a guide for the determin- 

 ation of the position of the various beds. Below Section 4, 

 are numerous exposures of the Moscow shale in the bed of 

 the stream, and these deserve attention. In Sections 5 to 7, 

 the Styliolina limestone occurs only at a considerable eleva- 

 tion above the base of the section, but the Encrinal limestone 

 can here be selected as the reference plane. 



The first of the South Shore Cliffs is convenientlv examined 

 after the Eighteen Mile Creek sections, as it will afford a 

 review, in ascending order, of the strata studied in the 

 gorge, in descending order. 



After reaching Pike Creek, leave the shore and return bv 

 the Lake-shore road or along the top of the cliffs, to the left 

 or southern bank of Eighteen Mile Creek, and follow the 

 road, which in many places skirts the bank, and affords 

 good general views of the sections, all the wav to North 

 Evans vilkige, and be\'ond. 



The Lake Shore Cliffs south of Pike Creek are best 

 approached from Derby or stations further south. A bicycle 

 will be found convenient, as the cliffs are all approachable 

 from the Lake-Shore road. A full day should be devoted to 

 the examination of these cliffs, while weeks niav be ad- 

 vantageousK' spent on them in detailed stud\'. 



