276 Reviews — Geological Survey of Western Australia. 



The remarkable folding and faulting of the region is well shown 

 in the Model and further explained in the Guide. Thus we have 

 normal faults, strike-faults, step-faults, etc., and, above all, the great 

 overthrust fault so conspicuous in its effects at Ballard Point. 

 Here the fracture is traceable for two miles inland, where it is cut 

 off by a cross-fault, and beyond this there is no positive evidence of 

 its existence as a fault in connection with the Chalk ridge to the 

 westward. The age of the sevei'al folds and tlie evidence of earlier 

 folds, proving the fact of recurrent folding on permanent lines of 

 weakness, are also discussed. 



After glancing at the river system, Mr. Strahan concludes with 

 a stratigraphical summary of the beds from the Kimmeridge Clay to 

 the Lower Bagshots, and this may be regarded as an epitome of 

 the several formations as developed in that district. The section 

 dealing with the Chalk is of especial interest, since it is admitted 

 that no reliable subdivision of the Chalk, of more than local value, 

 is possible except on palasontological grounds. The zonal tables of 

 Dr. Barrois and Dr. Rowe are added. The aggregate thickness 

 of the Secondary formations is estimated at rather more than 4,500 

 feet in the eastern, and rather less in the western, part of the region. 



VIIL — Geological Survey of Western Australia. By A. Gibb 

 Maitland, F.G.S., Government Geologist. Bulletins Nos. 8, 9, 

 and 11 to 20. 8vo. Perth, W.A., 1903-1905. 



IT is satisfactory to observe that West Australia, which originated 

 in the old Swan River Settlement, though the last to attain 

 equal rank with its sister dependencies of the Australian Common- 

 wealth, is in no way behind them in the enterprising spirit that 

 ministers so largely to the material progress of a new country. 

 Proof of such progress is to be found in the excellent reports, issued 

 under the authority of the Minister of Mines, here under review. 

 Besides these Bulletins annual '•' Progress Reports " have been issued 

 since 1897 which contain information relating to the Survey 

 administration, gold and other mining, general geology, and the 

 all-important subject, in mining districts, of water supply. The 

 publications encourage and enjoin the use of scientific methods to 

 aid in the rougher and more practical side of mining work, and 

 accordingly Mr. Gibb Maitland and his able associates have directed 

 their principal energies to the scientific examination of ore deposits, 

 and especially to that of the precious metal. 



Mr. JTaitland supplies a preliminary report on the geological 

 features and mineral resources of the Pillaara Goldfield (1904), which 

 had not been examined since Mr. H. P. Woodward, the then Govern- 

 ment Geologist, reported upon it about ten years previously. This 

 report is accompanied by geological and mining maps explanatory 

 of the text, which runs to 110 pages. It is stated that those parts of 

 the Pilbara Goldfield embraced in the report are, on the whole 

 promising, the 'reefs' giving every indication of permanence. 



