H 



is" 

 o 

 P5 



Epochs. Beds, Synonyms. 



Magnesian limestone, 

 Kupferschiefer. 



" Rothtodtliegende." 



(Subcarboniferous.) 



Pilton group, Clymenian. 

 Ilfracombe group, Eifelian. 



Lynton group, Spiriferian, 

 Coblenzian. 



Zechstein. 

 Rothliegende. 



Coal Measures. 

 Millstone grit. 

 Mountain lime- 

 stone. 



Upper D. — 

 Middle D.— 



Lower D. — 



o 



•<s> 



•n-BTuuej 



•snoaajraoqj-BQ 



•(9uo:^spu^g pa^ pjo) 



U'eiUOA9(][ 



< 



i 



O 



a, 





Coal Measures. 

 Millstone grit. 

 Mountain lime- 

 stone. 



> Upper D. — 



> Lower D. — 



' ' ' '1 



03 



CO 



cq 



Strata of the interior Conti- 

 nental Basin — Texas. 



(Subcarboniferous.) 

 Chester, St.Louis, Keokuk,Bur- 

 lington & Kinderhook groups. 



[ Chemung. 

 [Portage. 

 " Grenesee. 



Hamilton. 



Marcellus. 



Corniferous lime- 

 stone (Upper 

 Helderlijerg). 



Schoharie. 



Cauda-galli. 



Catskill. 

 Chemung. 



Hamilton. •< 



Cornifer- 

 ous. 



