BUFFALO SOCIETY OF NATURAL SCIENCES 



Salinan — Continued 





FEET 



INCHES 



10. Black shale, very fine textured, fissile, and with i inch 

 dolomite parting (eurypterid horizon) 



I 

 I 

 2 



6 



6 



ii. Green shale 





12. Dolomite like No. 2 



13. Green shale or marlite 





From West Branch of Allen Creek 



14. Light colored waterlime, some pyrites and sun cracks. . 



15. Pea-green shaly marlite 



5i 



Xiaearan 



16. An impure yellowish porous limestone 



17. Succeeded by an impure bituminous limestone made up 



of imbricating, shell-like domes, etc 



It is thus seen that there are 41 feet 7 inches between the Lock- 

 port dolomites and the Vernon red shales, although there are two 

 initial red beds, Nos. 7 and 3, showing that the red shale sedimenta- 

 tion was already in progress. A comparison of the two sections shows 

 that the first bed of red shale (No. 7) comes at from 2 to 5 feet above 

 the upper eurypterid-bearing bed, while the lower eurypterid bed 

 (No. 10) occurs 21 feet above the typical Lockport-Guelph. In the 

 lower interval are several thin beds of dolomite, and a waterlime 

 showing sun-cracks occurs. The two shale beds are separated by a 

 dolomite bed 10 inches thick, and in the lower black shale is a dolo- 

 mite parting | to 1 inch thick. The thin dolomite beds are often 

 sun-cracked, indicating temporary exposure during formation. 



The formations indicate a progressive change of conditions from 

 those of Niagaran (Guelph) time when the widespread Stromatopora 

 reefs were forming and the Guelph fauna flourished, through the period 

 when impure dolomites were deposited in thin, ripple-marked layers 

 containing some marine organisms and "fucoids," followed by condi- 

 tions favorable to the formation of the impure bituminous limestone, 

 to the final stage of the deposition of the impure porous limestone, 2 

 feet in thickness and containing a branching organism thought by 



