101 



Richmond and Lorraine 



Grey shales and limestone 

 Collingwood and Utica 



Dark shales 



Trenton and Black River 



Limestones, etc 



Lowville (?) 



Limestones 



Chazy 



Shale and limestone 



Thickness. 



Depth. 



Ft. 



M. 



Ft. 



205 



62 -32 



3,010 



165 



50-16 



3.175 



170 



51-68 



3,345 



115 



34-96 



3,46o 



317 



96-37 



3-777 



M. 



9I5-04 



965-20 



1016-88 



1051-84 



114820 



THE HAMILTON FORMATION AT THEDFORD 

 AND VICINITY. 



BY 



M. Y. Williams. 



INTRODUCTION. 



The villages of Thedford and Arkona are situated 

 in the midst of an excellent farming and fruit growing 

 region. For the most part the land is level, important 

 variations occurring only along the drainage channels. 



The physiographic features about Thedford are 

 directly related to the underlying formation which lies 

 nearly horizontal. The Aux Sables river has entrenched 

 its course 60 feet (18 m.) or more below the land surface. 

 The stream bed, though fairly well graded, has not developed 

 meanders. The secondary drainage channels are for the 

 most part youthful and descend over falls of considerable 

 height at a distance of 20 rods (100 m.) or more from 

 their confluence with the river. Interstream mounds and 

 rolling hills are occasionally present. The subsoil of the 

 country consists in most places of unsorted gravel of local 

 origin. Much of this gravel was formed on the shores of 

 post-glacial lakes, the strand lines of which are close together 

 at this point. Three distinct beaches are recognized in 

 the vicinity, the Ridgeway, the Arkona and the Forest. 



