578 president's address. 



report* made in lcS85 be states that the total thickness of hard 

 grits, conglomerates, limestones, and slaty shales of Devonian Age 

 is 10,944 feet, as developed at Mount Kinalian in the above 

 district.! 



Mr. H. P. Woodward describes^ Devonian rocks as being 

 largely developed in the Carr-Boyd Ranges of Kimberley, and in 

 a belt 200 miles long from the Saw Ranges to the Lubbock Range. 

 The Albert Edward and Barrier (at Kimberley) Ranges are also 

 probably formed of Devonian rocks. Near Dillon Springs, Kim- 

 berley, the Devonian rocks are formed of quartzites and slates. 

 They strike N.E. and S.W. and have been much folded, dipping 

 in places at 70°, whereas the adjoining Carboniferous strata are 

 nearly horizontal. The Devonian rocks are described by Mi-. 

 Woodward as consisting of sandstones, coarse grits, conglomerates, 

 shales, slates, and hard limestones, with veins of agate and chalce- 

 dony.§ Mr. Hardman also mentions || contemporaneous dolerites, 

 anamehite, volcanic breccias, ash beds, &c., in the Devonian Series, 

 the basalt being estimated to be 1000 to 1100 feet thick. The 

 lavas are stated to show distinct bedding in places at 5° to 10°. 

 The tuffs are composed of basalt and Devonian grit. 



The statement, however, made by Mr. Hardman in his 1885 

 Report, p. 19, that these basalts pass into diorite in places, horn- 

 blende replacing augite, and his statement in his 1884 Report, 

 p. 18, that immediately over the basalts the carboniferous lime- 

 stone passes into red jasper, are very suggestiv^e of these basic 

 and intermediate rocks being intrusive laccolites, like the gabbros 

 of portions of the Tiers of Tasmania, the intrusive character of 

 which has been ably proved by Mr. Thomas Stephens, M.A. 



Summary of Devonian Period. — In Victoria in Lower Devonian 

 time extensive volcanic eruptions took place of subaerial or 



* Loc. cit. p. 20. 



t Geol. Mag. No. 309, pp. 100-102, and No. 311, pp. 193-199. 



% Report on the Goldfields of the Kimberley District. By authority. 



Perth, 1891. p. 10. 



§ Loc. cit. p. 9. 



II Loc. cit. p. 18, and Report on the Geology of the Kimberley District, 



Western Australia. By authority. Perth, 1885. p. 19. 



