134 THE CANADIAN NATURALIST. [Vol. X. 



Section I. (at Dundas). 



In descending order : Beds 20-14 Avere measured above Limekiln. 

 Beds 13-2, measured at the south-western side of Glen Spencer, 

 are correlated with those above. Series of beds numbered 1 is at 

 Artesian Well. 



Beds. Niagara Formation. Thickness. 



No. Feet. 

 20 Fine grained gray arenaceous dolomite. Top bed 



glaciated. (Height above Lake Ontario 517 ft.) .. 10.6 



19 Dark dolomites (somewhat bituminous) containing 



concretionar}' masses of a brecciated appearance . . 9.7 



18 Measures concealed 10.2 



17 Gray and drab dolomites in thin beds — the upper 

 portion forming brow of escarpment just east of 

 " Peak." .". 28.3 



16 Earthy dolomites with conchoidal fracture 3.2 



15 Dolomitic shales covered with incrustations of ep- 



somite 3.5 



14 Gray and variegated dolomites in thin beds with 



earthy partings 38 . 4 



103.9 



13 Cherty dolomites (?) concealed, by measurement 3.1 



feet, but allowing for dip, 3.0 feet must be added, 

 and this connects the section at the Limekiln 

 with that measured at western side of Kavine from 

 Webster's to Spencers Falls 6.1 



12 Gray dolomites with numerous cherty nodules, this 

 forms the brow of cliff at junction of Eavines from 

 Spencers and Webster's Falls 12.0 



1] Shal}^ dolomites, Avith shaly partings 2.0 



10 Compact dark gray dolomites, more or less argillo- 

 arenaceous, in beds from two to two and a half feet 

 thick 16.9 



9 Dolomitic blue shales, with shaly dolomites 13.1 



8 Compact light gray dolomite in one bed. This bed 

 is constant for many miles, and it was from this 

 that the dip was calculated, and checked in by 

 other beds 5.3 



7 Niagara dolomites, covered here, but exposed else- 

 where 10.0 



65.4 



Clinton Formation. 



Clinton bluish shales, with numerous thin beds of 

 argillaceous dolomites, some of which are also very 

 ferruginous, others are more arenaceous. Many 

 contain fossils. Portions of the series are covered, 

 but, being exposed in numerous places, show the 

 character of the whole formation just described ... 77.5 



Argillo-arenaceous dolomites, which may be con- 

 sidered as beds of passage to the Medina beneath . 8.2 



85.7 



