135 



geologists are not prepared to accept the classification 

 herein adopted. 



Cataract shales and limestones are not well exposed 

 on the west side of the ravine of Forty Mile creek, but in 

 the cliff on the east side the contacts may be observed. 

 Owing to a heavy talus, this location is not as good a col- 

 lecting ground as at Stony Creek, between Grimsby and 

 Hamilton, or at Hamilton itself. The more common 

 species are given below; for a more complete list see the 

 guide to Excursion B 4. 



Corals — 



Favosites cf. niagarensisa {Hall) 



Zaphrentis bilateralis {Hall) 

 Hydrozoans — 



Clathrodictyon vesiculosum Nicholson and Murie 



Retiolites venosus Hall 

 Brachiopods — 



Anoplotheca planoconvexa {Hall) 



Atrypa reticularis {Linn) 



Atrypa cf. rugosa Hall 



Camarotcechia neglecta {Hall) 



Dalmanella elegantula {Dalman) 



Hebertella fausta Foerste 



Leptaena rhomboidalis {Wilckens) 



Lingula lingulata Hall and Clarke 



Lingula cf. clintoni Vanuxem 



Lingula oblata Hall 



Lingula oblonga Hall 



Orthis flabellites Foersie 



Platystrophia biforata {Schlotheim) 



Plectambonites transversalis {Wahlenberg) 



Rhipidomella cf. circulus {Hall) 



Rhipidomella hybrida {Sowerby) 



Schuchertella sp. 



Whitfieldella sp. 

 Bryozoans — 



Clathropora frondosa Hall 



Helopora fragilis Hall 



Phsenopora constellata Hall 



Phsenopora ensiformis Hall 



Phsenopora explanata Hall 



Rhinopora verrucosa Hall 



