t 



\ 



152. ON COLOURING GEOGNOSTICAL MAPS 



Alum-slate.— Pale bluish-black, falling in- 

 to grey. 



Flinty-slate.— Deep ash-grey. 



Grey-wacke slate, and Grey-wacke.- 

 Greenish-grey, falling into yellow. 



Trap-rocks. — 

 Blackish - green. 



Granular primitive trap, S 



Greenstone, 



h>^| j inclining to 



Greenstone- slate, 



EEisO Hornblende-slate, J 



Basalt. — Greenish-black. 



Porphyry-slate. — Pale greenish-black. 



Amygdaloid. — Pale greenish-black, slightly 

 inclining to brown. 



1 1 1 Serpentine.— Pale pistachio- green. 



Talc and Chlorite slate. — Pale grass- green. 



Porphyry.— -Pale reddish -brown, slightly in- 

 clining to yellow. 



Sienite.-— Pale reddish-brown, inclining to 

 bluish, that is, clove brown, passing into 

 bluish -red. 



