ON COLOURING GEOGNOSTICAL MAPS. I53 



VI J prim. 1. Granular primitive Limestone. — 

 I Pale Berlin-blue. 



U/ prim. 2. Compact primitive Limestone, — > 

 t T Smalt blue, faintly inclining to red. 



VI/ tran. Transition Limestone. — Indigo-blue, 



- slightly inclining to grey. 



vL/fl. 1. Flcetz Limestone. — Pale bluish-grey, 

 without any trace of grey. 



Vj^ch. Chalk.— Milk-white, that is, bluish-* 



1 



white. 



Calc-tufF. — Smoke-grey. 



prim. Older 



fl. 1. Newer 



Gypsum . — Pale sky-blue, 

 f that is, blue inclining to 

 green. 



j 



Rock-salt, and rocks from which salt springs 

 issue. — Pale verdigris-green. 



o 



o /\ 0 Common, "1 Coal- formation.— Pale 



i blackish-brown, ap- 

 proaching to yel- 



A 



^ With mercury. 



lowish-brown. 



