82 



of Columnar ia alveolata, Calapoecia huronensis, and Tet- 

 radium indicate the Saluda. 



Upper Richmond. — At Manitowaning, a Stromato- 

 cerium horizon occurs far above any of the levels at which 

 Beatricea has been found. This Manitowaning Stromato- 

 cerium reef limits the top of the Middle Richmond. It is 

 widely distributed and has been traced as far west as Barrie 

 island, west of Gore bay. In the vicinity of Kagawong it 

 is overlaid by a horizon rich in silicified pelecypods, includ- 

 ing Cyrtodonta ponderosa, Ctenodonta iphigenia, and 

 Ortonella hainesi. The last named species suggests a trace 

 of the Whitewater fauna, although Leperditia caecigena, 

 Primitia lativia, and other ostracods occurring at numerous 

 localities above the Manitowaning Stromatocerium reef, 

 indicate the Saluda of Indiana. 



Possibly the most interesting fact is the evidence that 

 this Upper Richmond ostracod fauna, with some of its 

 associated brachiopod and pelecypod species, occurs also 

 in the western extension of the Queenston shales of New 

 York, as exposed on the southern shores of Lake Huron 

 between Collingwood and Owen Sound 



Fossils from the Clay Cliffs. — Among the fossils 

 which have been described from the Clay Cliffs may be 

 mentioned : — 



Stromatocerium huronense Billings. 



Calapoecia huronensis Billings. 



Stroptelasma canadensis Billings (rusticum Bil- 

 lings). 



Tetradium huronensis Foord. 



Strophomena huronensis Foerste. 



Ctenodonta iphigenia Billings. 



Cyrtodonta ponderosa Billings. 



Helicotoma brocki Foerste. 



Liospira helena (Billings). 



Cyrtoceras lysander Billings. 



Cyrtoceras postumius Billings. 



Orthoceras piso Billings. 

 To these might be added, as coming at least from the Lake 

 Huron area : Licrophycus hudsonicum, Billings, from Mani- 

 towaning bay, Cyclocystoides huronensis, Billings, from the 

 Beatricea undulata horizon on Rabbit island, Vanuxemia 

 bayfieldi, Billings, from the Upper Richmond on Bayfield 

 Sound, and Cyrtoceras ligarius, Billings, from the Richmond 

 on Drummond island. 



