10 GEOLOGY OF ERIE COUNTY 



The Bertie limestone beds in the quarries of the Buffalo 

 Cement Works are characterized by the occurrence in them of an 

 abundant and peculiar Eurypterid fauna. These eurypterids were 

 crustaceans of the type of which the horse-shoe crab is a modern 

 representative. Their fossil remains have been found in five 

 colonies in New York, all in Siluric rocks. Of these five, the 

 colony at the Buffalo Cement quarry has produced the finest and 

 most numerous remains, and through the kindness of Mr. 

 Lewis J. Bennett the Buffalo Society of Natural Sciences has 

 acquired a large and exceptionally fine collection of these. 



Besides the eurypterids a few other fossils have been 

 described from the Bertie limestone. A list follows: 

 Eurypterida 



E. remipes Dekav. 



E. lacustris Hall. 



E. lacustris var. pachychirus Hall. 



E. dekayi Hall. 



E. pustulosus Hall. 



Eusarcus scorpionis Grote and Pitt. 



Dolichopterus macrochirus Hall. 



D. siluriceps nov. 



Pterygotus buffaloensis Pohlman. 



P. cobbi Hall. 



P. grandis Pohlman. 

 Ostracod 



Leperditia scalaris Jones. 

 Brachiopoda 



Orbiculoidea. 



Lingula. 



Plants 



(Sea weed) Bvthotrephis lesquereuxi. Grote and 

 Pitt. 



Analysis of cement beds, Bertie limestone, furnished to the 

 State Education Department by Mr. Lewis J. Bennet. 



Silica 11.48 



Iron .90 



Alumina 17.50 



Carbonate of lime 42.75 



Magnesia (carbonate) 20.35 



Potassium 1.00 



Sodium .80 



Combined water and loss 5.22 



