26 
of which an excellent example, the Black Range (Fig. 28) is to be 
seen in Pilbara. The name is given from the almost black 
weathered rocks of which the range is made up. One of these 
dykes or sills may be seen near Mt. Frew* invading the sedimen- 
tary rocks along the planes of bedding. (Fig, 29). 
Fig. 28. 
Dolerile Dyke, Black Range, Hillside, Bi.bara Goldfield. 
Fig 29. 
Dolerile Sill in Sedimentaiy Rock = , Mount Frew. 
*Lands Dept. Litho, 90/300. 
