26 



GEOLOGY. 



TABLE OF STRATIFIED ROCKS. 



Periods 



Systems. 



Formations 



Ph • 



^£ 



Eh Ph 



a? 



Post-Tertiary 

 Pleistocene. 

 (250 ft.) 



( Peat, Cave and Valley- 

 | Gravel Deposits. 

 ■{ Brick-earths and Loess. 

 | Raised Beaches, &c. 

 I. Boulder-Clay and Gravels. 



o 

 < o 



Ph^ 



Pliocene (100 ft. 



Norwich, Red, and Coral- 

 line Crags. 



Miocene (125 ft.) | Bovey Beds (?). 



Eocene (2,600 ft.) 



Cretaceous. 

 (7,000 ft.) 



Fluvio-Marine Series. 

 Bagshot Beds. 

 London Tertiaries. 



Life-Periods. 



Maestricht Beds. 

 Chalk. 



Upper Greensand. 

 Gault. 

 Neocomian. 

 Weald en. 



Jurassic. 

 (3,000 ft.) 



Purbeck Beds. 

 Portland Beds. 

 Kimmeridge Clay. 

 Coral Rag. 

 Oxford Clay. 

 Great Oolite. 

 Inferior Oolite. 

 Lias. 



Triassic. 

 (3,000 ft.) 



Rheetic. 

 j Keuper. 

 ] Muschelkalk. 

 ^Bunter. 



s ! 



•IH O) 

 02 ,-Q i 



Ph ^ &H 



Ph 5 



Ph 



02 TO 



ft s 

 J? s 



2 ^3 



.5 c 



a 53 



o J2 



,Ph ^ 





Permian. ' j Red Sandstone, Marl, 

 (500 to 3,000 ft.) ^ Magnesian Limestone, &c. 



o* 



1— 1 



o 

 o 



<! 



Ph 



Carboniferous. 

 (12,000 ft.) 



Coal Measures. 

 Carboniferous Limestone. 



Devonian. 

 (5,000 to 10,000 ft.) 



Devonian. 



Old Red Sandstone. 



,RY or 



Silurian. 

 (3,000 to 20,000 ft.) 



Upper Silurian. 

 Lower Silurian. 



PRIMii 



Cambrian. 1 

 20,000 to 30,000 ft.) | 



Cambrian. 





Laurentian, &c. 

 (30,000 ft.) | 



Laurentian. 



35 



■5* < 



J § 

 a E2 



