102 
Plate XV. 
Fig. 1. — Range of desert sandstone at Yarrabollinna Waterhole. 
The bluff consists of excessively fine-grained arena- 
ceous material, with nodules of chert and barytes. 
Fig. 2. — Krupp Hill : a teble-hill of desert sandstone unconform- 
ablj'' overlying primary schists. 
Plate XVI. 
Fig. 1.— Table- hills of the desert sandstone formation east of 
Indulkana. 
Fig. 2. — Talus blocks of gneiss in G^amet Glen, south of Mount 
Edwin, Mann Ranges. This rock is described in the 
text on page 95. 
Plate XVII. 
Fig. 1. — Olivine gabbro, Mount Davies, Tomkinson Ranges. 
Fig. 2.— Garnetiterous gneiss, north of Mount Davies, Tomkinson 
Ranges. 
Fig. 3. — Diorite, Indulkana. 
Fig. 4. — Epidote rock, Titania Spring, Musgrave Ranges, 
Plate XVIII. 
Fig. 1. — Gneiss, Indulkana, west of Krupp Hill. 
Fig. 2. — Homblendic granite, Glen Ferdinand, Musgrave Ranges. 
Fig. 3. — Hypersthene- bearing granulite, north of Mount Davies, 
Tomkinson Ranges. 
Fig. 4. — Altered augite granite, south of Giles' West Camp, Mus- 
grave Ranges. 
Plate XIX. 
Sketch section across the Mann R^anges, extending south from 
Mount Cockburn. Distance, about 2^ miles. 
Plate XX. 
Geological sketch map of the Ayers Ranges. 
