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

 Valley and near North Boston. 



Detailed Description of the Sections. — There are eij^ht 

 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 ot ninety and one-half feet, 

 although at the bridge the height is onh' 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. 



[Grey Naples or Cashaqua 30 " 



$Black Genesee 9.5 " 



Gray Genesee 8.5 " 



Styliolina bed 5 " 



Conodont Limestone .* 25 " 



Shale 25 " 



AIoscow Limestone and Shale 1.50 " 



Total 90. 50 feet. 



*This is the way in which these sections were designated in the field notes, but in 

 my paper on the " Faunas of the Hamilton Groxip of Eijihteen Mile Creek ;ind 

 Vicinity " thev are lettered from the lake shore upwards, the present one being 

 Section" H. " 



fProf. Hall assigns a thickness of thirtv-thrce feet to this rock on the shore of 

 Lake Erie.— (ieol. Rept., 4th Dist., 1S43, p". 227. 



tThe whole thickness of the Genesee on the shore of Lake Eric is made by Hall 

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



