66 



dolomites beneath, he ascribes to the upper part of the 

 Monroe formation, which is made to include all strata 

 between the top of the Salina and the base of the Devonian. 



Eroded surface of Anderdon high grade limestone with Onondaga dolomitic 

 limestone in the background. Solvay Process Co's quarry. 

 Amherstburg, Ontario, 



The high grade Anderdon limestone is not rich in 

 fossils, but it presents a coral and Stromatopora reef from 

 which Grabau obtained the following species: — 



Clathrodictyon ostiolatum, Nicholson. 

 Clathrodictyon variolare, vonRosen. 

 Idiostroma nattressi, Grabau. 

 Stromatopora galtensis (Dawson.) 

 Stylodictyon sherzeri, Grabau. 

 Ceratopora tenella ( Rominger . ) 

 Cladopora bL r urcata, Grabau. 

 Cyathophyllum thoroldense, Lambe. 



