112 



Kilometres t^e underlying Onondaga strata are compara- 

 tively near the surface and have been worked 

 in several quarries, besides presenting natural 

 exposures along the Thames river. The Onon- 

 daga strata at this point are less coralline, but 

 richer in other forms than at Hagersville. 

 Among the more common species are the fol- 

 lowing: — 



Favosites hemispherica E. and H. 



Streptelasma prolificum (Billings) 



Atrypa reticularis (Linnceus) 



Chonetes hemisphericus Hall 



Leptaena rhomboidalis (Wilckens) 



Martinia maia (Billings) 



Meristella nasuta (Conrad) 



Spirifer duodenarius (Hall) 



Spirifer gregarius Clapp 



Stropheodonta demissa (Conrad) 



Stropheodonta inequistriata (Conrad) 



Strophonella ampla Hall 



Aviculopecten princeps (Conrad) 

 Concardium cuneus (Conrad) 

 Panenka grandis Whiteaves 

 Vanuxemia tomkinsi Billings 

 Paracyclas elliptica Hall 

 Platyceras ventricosum (Conrad) 



Cyrtoceras sp. 



Gomphoceras eximium Hall 



Gyroceras Cyclops Hall 



Nautilus sp. 



Orthoceras sp. 



Macropetalichthys sullivanti Newberry. 



48-5 m. Stratford— Alt. 1,188 -8 ft. (48-51 m.). This 



78 km. city, which is an important railway and manu- 

 facturing centre, is situated nearly on the sum- 

 mit between Toronto and Sarnia. The drift at 

 this point is heavy, reaching a thickness of 

 143 feet (43 -_6 m.). From Stratford to Guelph 

 the country is rolling and of morainic character, 

 with occasional gravel bars of post-glacial 

 origin. 



