Reviews — Geological Survey of Western Australia. 277 



Facilities for transport are, however, much needed, if the resources 

 of the district are to be properly developed. The stratigraphical 

 sequence of the district examined is for the present largely con- 

 jectural ; the presence of Tertiary, Cambrian, and Archsean rocks is 

 assumed, but with doubt. 



In a later report (Bulletin No. 20, 1905) Mr. Maitland continues 

 his examination of the Pilbara Goldfield in greater detail, describing 

 various mining centres with their auriferous deposits. This report 

 is illustrated with plates, textual figures, and coloured maps and 

 sections. 



Bulletin No. 11 (1903) contains Mr. Maitland's notes on the North 

 Coolgardie Goldfield, a detailed account of the mines of this famous 

 region, illustrated with sketch-maps. He also, with the assistance 

 of Mr. 0. F. V. Jackson, supplies in Bulletin No. 16 an account of 

 the mineral production of Western Australia up to the end of the 

 year 1903. This i-eport is accompanied by a map of Western 

 Australia, showing the goldfields and other mining districts, and the 

 distribution of useful minerals, which include gold, silver, iron, 

 copper, lead, tin, diamonds, coal, mica, graphite, etc. 



The geological features and mineral resources of the Northampton 

 district are dealt with by Mr. Gibb Maitland in Bulletin No. 9 

 (1903), which contains Appendices by Messrs. H. P. Woodward, 

 J. Provis, and E. S. Simpson. This district was first explored by 

 Mr. Henry Y. Lyell Brown in 1871, who was at that time Govern- 

 ment Geologist; his report being followed in 1888 by that of 

 Mr. H. P. Woodward, who also wrote an able report upon the 

 copper and lead mines of the district in 1895. The principal object 

 of attainment was the accurate mapping of certain igneous rocks 

 (basic dykes) which might afford a guide as to the horizontal 

 extension of the metalliferous minerals, and thus assist the operations 

 of private enterprise. 



The work of Mr. Charles G. Gibson, Assistant Government Geo- 

 logist, is recorded in Bulletins 8, 12, 14, and 17. The geology and 

 the auriferous and other mineral deposits of the North Coolgardie, 

 Murchison, and Tilgarn Goldfields were investigated. The "Auri- 

 ferous Series " of the Murchison Goldfield, which contains the 

 gold-bearing rocks, consists of " persistent zones of schist and allied 

 metamorphic rocks." The most profitable of the gold-bearing rocks 

 are the greenstones, though certain quartz rocks occurring in the 

 granite are also auriferous. Maps, plates, and textual figures 

 accompany and elucidate all these reports. 



Finally, we may note Mr. C. F. V. Jackson's reports (Bulletins 

 Nos. 13 and 18) on portions of North Coolgardie and Mount 

 Margaret Goldfields. These contain much detailed information 

 concerning the geological features, mines, and auriferous deposits 

 of tlie districts surveyed, with ample illustrations of all kinds, as 

 well as maps and sections. A. H. F. 



