1867.] 



' Thesaurus Siluricus.' 



381 



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Upper 

 Silurian. 



Horizons. 

















































1 : 























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1 00 



CO 







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CO 



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tH <M CO i-l lO 1> 



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 cq I— 1 1— 1 1— i 



a 



Middle 

 SUuriati. , 



Horizons. | 



















































• 



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(M 7-1 



















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Lower 

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Horizons. 



o 1 







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^ 1 





TtH tH rH 00 







i-( (M 







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locq 





00 1 ; 



Thi rH rH Ci CO T-1 rH ; lO .-1 00 00 CO CO CO 



I— < .1—1 T— 1 









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 1—1 





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Primordial. 



Upper. 



Horizons. 



^ 1 



















































^ 1 





















































CO 1 









































!— 1 







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1—1 





































Lower. 



Horizons. 



o 1 















































































































CO 



























I— I 



























'•CO 









00 





























I—I 



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1—1 1—* (Mr-I (M r-H I— I 



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