53 



region. I have one from the Everard Plain, but they are most 

 numerous among the portioiis of the plain whose surface is strewn 

 with chalcedony and ironstone nodules. I found none in situ, 

 but in the Peake Range, and afterwards in the Macdonnells, I 

 picked up in the creek-debris fragments of what is apparently 

 sanidine felspar, but of which the parent rock was not seen. 



EXPLANATIONS TO PLATE. 

 Fig. I. — SecTiox across Southern end of the Denison Range. 



1. Table land sandstone (Tertiary). 



2. Blue clay and gypsum (Cretaceous). 



3. Ironstone mass. 



4. Argillaceous and talcose slates ( pj.i„,„j.,. 



5. Quartzite bands in argillaceous and hydro-mica slates \ ^' 



Fig. 2. — Section across Middle portion of Denison Range. 



1. Table land sandstone (Tertiary). 



2. Blue clays and Gypsum (Cretaceous), 



3. Granite. 



4. Syenite. 



5. Argillaceous and hornblendic schists. 



6. Quartzite bands and talcose slates. 



Fig. 3. — Algebuckinna Gold Field, R. Neales. 



1. Sandy kaolin ~] 



2. Gravel cement (auriferous) . 



3. Sandy cement I 



4. Gravel cement )-Tertiary. 



5. Sandy cement 1 



6. Gravel cement | 



7. Compact sandstone J 



8. Argillaceous and Hornblendic Schists with Garnets and Copper. 



9. Granite dyke. 



10. Quartz-syenite dyke. 



Fig. 4. — Typical Escarpment of Table Land. 



1. Cretaceous clays with beds of shell limestone and gypsum. 



2. Bed of nodular ironstone. 



3. White sandy grits often argillaceous. 



4. Porcelainised sandstone. 



Fig. 5. — Section across Mt. Charlotte Range, 12 Miles North of 

 Chambers Pillar. 



1. Sandy thin beds of shale with manganic ironstone. 



2. Siliceous limestone. 



3. Calcareous earthy beds with seams of manganic ironstone. 



4. Argillaceous limestones of oolitic structure. 



5. Fissile sandstones. 



Fig. 6. — Section across Macdonnell Ranges to Great Plateau. 



