48 



Dr. Mac Culloch on 



ARTIFICIAL SYSTEM. 



SECONDARY CLASS. 



STRATIFIED. 



♦Sandstone. Conglomerate and fine. Old red, of 



various colours and qualities. 

 Limestone. Mountain limestone of English. Tran- 

 sition of some. 

 Sandstone, various. 

 •(•Shale ) Ait . 

 *Clay } dltt0 ' 

 Limestone. 

 Coal. 



Limestone — Magnesian, first above the coal series. 

 ,, % Argillaceous. Lias. Muschelkalk, &c 



,, Compact, various ; generally organic. 



„ Oolithic. 



Chalk. 

 ^Sandstone— Red marl. Red sandstone, containing 



salt and gypsum. 



£ < 

 I 



jo 



Quadersand- 



ui 



„ White, various, and sand. 



stein, &c. 

 „ Green, and sand \ 



„ Ferruginous, and sand J 



t^Variou, 



Jasper, modified from * "j Partial, only where 



Siliceous schist, modified from + \ trap-rocks are 

 Chert, modified from % \ present. 



Salt and gypsum considered as minerals in this class. 



UNSTRATJFIED. 



Serpentine, as connected with trap chiefly. 

 Pitchstone, comprising pearlstone. Known in veins 



only. 

 /Trap— Indurated clay ; base of the amygdaloids. 



Claystone. 



Indurated claystone ; comprising some basalts. 



Clinkstone. 



Compact felspar. 



Basalt ; of hornblende only. 



Greenstone. 



Syenite. Sometimes emulating granite. 



Augit rock. 



Hypersthene rock. 



Porphyries ; with various bases. 

 ^ „ Amygdaloids. 



a 

 5 



| 



E 



o 



2 Ph 



ft 



NATURAL 

 SYSTEM. 



CLASS 3. 



CLASS 4. 



CLASS 5. 



CLASS 6. 



CLASS 7. 



