1191 
the strike chiefly being W.N.W. to N.N.W., and the dip alternating 
between north east and south west; the sandstones and conglo- 
merates which unconformably overlie the schists and the granite, 
and are far younger, dip away from the granite-mass on both sides. 
In his description of a portion of the Western Coast of Sumatr: 
Fig. 1. Map of the granitic mass of the Rokan-county (after the map in the 
“Jaarboek van het Mijuwezen in Nederlandsch Indië” for 1902, made under the 
supervision of the engineer E. A. NeeEB). Scale 1 to 100.000. 
Fig. 2. Intersection over the middle of fig. 1. 
XXX 
granites, diorites etc. schists etc. tertiary. 
