504 Clarke — Geology of Western Australia. 



first connected account of tlie geology of a territory new to 

 science : — ^ 



Description of Mr. Hunt's Specmens East op York, "W. A., between 31° 

 AND 31° 12' S. Lat. and between 121° 12' and 121° 22' E. Long, on the 

 N.W. OF Lower Lake Lefrot, collected in 1865. 



A. — From Well near Camp 25. 



1. Grey soft micaceous clay slate filled with, minute white par- 

 ticles ; 12 feet deep. 



2. Soft bluish grey glossy slate ; 15 feet. 



B. — From surface of the Gully-hed. 



3. Brownish-blue ferruginous slate, full of iron and white glossy 

 particles. 



4. A gneissiform grey-bedded and jointed foliated but hard rock, 

 with used mica, and a small proportion of quartz in a felspathic base, 

 holding numerous cubic crystals of bisulphuret of iron decomposing 

 into hydrated iron, as in the trap rocks of the Harding Eiver. 



5. Ironstone-conglomerate, consisting of numerovis shining black 

 water- worn rudely crystalline particles of magnetic iron, which in 

 some examples -possess polarity ; brownish-red hydrated oxide of iron ; 

 small clear crystalline bits of quartz ; opaque quartz, and one or two 

 particles of trap, all cemented by a hard celhilar mineral effervescing 

 with hydrochloric acid. Presumed to be of Tertiary or recent origin, 

 arising from a calcareous spring producing tufa and collecting small 

 loose stones from the surface of a water-course. 



C.—From Bed Hill Gully. 



6. Decomposed granite. 



7. Decomposed granite, with a slight saline taste. 



8. Brownish white coarse deposit.* 



9. Brown and white bedded deposit; decomposed slate or granite. 



10. Ferruginous sandy deposit, probably decomposed granite. 



11. White crumbly kaolin-like deposit. 



12. Coarser, red and yellow deposit. 



13. White soft clay-slate, perhaps the source of some of the pre- 

 ceding five samples. 



14. Cavernous ferruginous quartz, part of a vein, probably from 

 granite. 



D. — From Stony Sill. 



15. Hydrated iron, not magnetic. 



16. Semi-opal. 



17. Hardened white deposit, hydro -magnesite. 



E. — From Tanlc near Stony Hill ; 4 feet helow surface. 



18. White soft, nearly pure alumina. 



F. — From Bidge 8 miles due East of Saddle Hill. 



19. Drift-pebble of air-and- water- worn concretionary rock ; sili- 

 ceous in composition and probably formed in some soft deposit — or, 



1 From the " Perth Gazette and Western Australia Times," Friday, April 20, 1866. 

 - This word "deposit" explains the sedimentary natui'e of the substances which 

 are properly " silicates of alumina." 



