4 



P. L. Grabau, however, reports its existence near Water 

 Vallcv and near North Boston. 



Detailed Description of the Sections. — There are eight 

 sections between the railroad bridges and the lake shore. 

 These will be considered in descending order, beginning with 

 the one at the stone railroad bridge on the right side of the 

 stream, which will here be designated Section 1.* ( Plate IV. ). 



Section 1 (H). 



Plate IV. 



This section has a total height of ninety and one-half feet, 

 although at the bridge the height is only eighty-eight feet. 

 The length of the section is about eight hundred feet, and it 

 extends north 50 degrees west, by south 50 degrees east. 

 The strata dip one degree to the south-east. Near the 

 lower end of the section is a small lateral ravine ( "Philip's 

 ravine") which extends back three hundred feet or more, 

 where a vertical wall of shale terminates it. This ravine 

 affords a good opportunity for the examination of the upper 

 beds of this section, especially the "Cashaqua" shales. 



The following is the thickness of the various beds exposed 

 in this section, taking them in descending order: 



Black Naples or Gardeau 40 feet. 



fGrey Naples or Cashaqua 30 



JBlack Genesee 9.5 



Gray Genesee 8 . o 



Styliolina bed ° 



Conodont Limestone 25 



Shale 25 » 



Moscow Limestone and Shale. ..r 1.50 



Total 90.50 feet. 



•This is the- way in which these sections wen- designated in the field notes, Imt in 

 my paper on the "Faunas of the Hamilton Group of Eighteen Mile Creek and 

 Vicinity" they are lettered from the lake shore upwards, the present <>n<- being 

 Section II. 



fProf. Hall assigns a thickness of thirty-three feet t<> tliis rock on the shore <>l 

 Lake Brie.— Geol. Rept., Ith Hist., 1843, p. 227. 



JTIh whole thickness of the Genesee on the shore of Lake Erie is made by Hall 

 twenty three feet and seven inches. — Ibid, p. 221. 



