BRACHIOPODA. 



275 



00 



h-t 



2 

 ►3 



03 



sa 



m 





c^ 



►Tj 



H 



-g 



H 



H 



M 



a 



o 







J" 



f> 



?3 



u 



bd 









1 







O; 



?o 



1 ; 



K 



CB 





"* 



c3 





Ctq 



H 



s 



GO 



O 

 ST' 



d 



w 



> 



CfC5 





m 



O 



g^ 



9 



►tI 



rt 





H 



hj 



K 





m 



!> 



o 







V 



h3 



W 











o 



>-H 



O 



K 



H 



a 

 g 



H 



W 



Z 



"* 



>^ 



CO 



?- 







•t| 







<1 



•:/;' 

 o 









■^ CO 







I I 1 





1 



1 1 r-' '^ 11 







' 



Lowex- Cambrian. 





Middle Cambriau. 





Upper Cambrian. 



1 





Calciferous. 







Chazy. 









Trenton. 









Utica. 





^ 





Hudson River. 



1 



CD 

 CO 



■ 





Clinton. 

 Niagara. 



; 1 5 



3, 







Lower Helderber^. 



f 1 







Orisliany. 



H I 







Upper Helflerberg. 



^ 1 









s 







Hamilton. 



o 







Ciiemung. 





f-i 











p 



P 







Waverl}'. 





*? 







Burlington. 

 Keokut. 





I 





St. Louis. 











Kaslvasliia, 

 Chester. 











Lr. Coal Measures. 





1 







Middle and Upper 

 Coal Meaaut-es. 









Permian. 















Triassic. 



