142 HISTORICAL GEOLOGY. 



Periods. Fig. 201. 



w 



«<! 



D 

 o 

 IS 

 w 

 a, 



£ 

 o 

 so 

 PS 

 ■< 

 O 



1 



Permian. 



—-^—'— — •— 



15 

 14c 



14b 



14a 

 13b 



13a 



1 



i ' i i , ' .,. 





-_-_-_ ._ z-; _-_-^^ 



f 

 Carboniferous. 



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~-^t~^t^ ^fz^d- 



: ^==-^sr_ -, ^..=r..,. .nfl^w 



5ci„oa l i<\ 707,-1 00 o"d" r f> co s 





fe==Fi^- | ^^ipll 







Subcarboniferous. 















a 



o 



H 



O 



s 



a" 



< 

 to 



o 



> 



Catakill. 





12 

 lib 



11a 



10c 



10b 

 10a 



9c 

 9b 

 9a 



Chemung. 





iBS" — iBi 



Hamilton. 



- . 



Corniferou3. 













W 



■* 

 US 

 H 

 W 



PS 



5 



a 



o 



O 



<! 



fa 



o 



&r 



< 



< 

 S 



3 



H 



X 



'fa 

 P 



in 



a 

 a 



Oriskany. |' ' : : : 5 : ^:;::.v::":::X;:v': ''■:-'' 



8 



7 



6 

 5c 

 5b 



5a 



4c 

 4b 



4a 



Lower Helderberg 







1 ; J 1 L ' \ L_ 



Salina. 



^?=?=^£^3I 



Niagara. 







^Esasgafff - t" — ^ T~^ 



- 



'X%->r%->i-»"-x-»i"»"."i"i"".v 



jQocP »° O 0<?A» oO a J ° O 



H 



C8 

 •fa 

 P 



cn 



o 



►J 



Trenton. 



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■ "rS ° 



=±=n±= = s^l~Z. : E-~^===±=-- 



— ■— -— ^^ i - 1 — / ; , — '■ — 1 — 



Canadian. 



, ' , — —, — ! 1 ! 1 1 ' , ' , ' 



1 3c 









J 3b 





I in 





8a 

 •2b 

 2a 













Primordial or Cambrian. 



-.•■■ — * _^-:-:.::. 







| 



H88ff-- -~Miill3i| 







Archaean. 



/ V v V v v v v v V V V \ 

 VVVVVVVVVvvV 

 'vvvvvVvvvvVV 



1 



Epochs. 



Permian. 



Upper Coal Measures 



Lower Coal Measures 



Millstone Grit. 



Upper. 



Lower. 



Catskilk 



Chemung. 



Portage. 

 Genesee. 



Hamilton. 



Marcellus. 



Corniferous. 

 Schoharie. 

 Cauda-Galli. 

 Oriskany. 



Lower Helderberg. 

 Salina. 

 Niagara. 

 Clinton. 



Medina. 



Cincinnati. 

 Utica. 



Trenton. 



Chazy. 



Quebec. 



Calciferous. 



Potsdam. 

 Acadian. 

 Archaean. 



