4:64: Scientific Intelligence. 



conglomerates. 3. Nullagine, sandstones, thin beds of limestones 

 and volcanic rocks. 4. Oakover, sandstones, limestones and 

 charts separated by a marked unconformity from the Nullagine. 

 The absence of fossils renders the age of the beds unknown. 

 There is some evidence for considering the Nullagine of Cam- 

 brian age. In addition to gold, the Pilbara field bids fair to con- 

 tinue as a producer of tin and tantalum. In the granite of the 

 Cooglegong tin field occurs the rare mineral gadolinite, the fol- 

 lowing analysis of which has been made by B. F. Davis : 



Silica, SiO„ 23-33 



Iron protoxide, FeO 10-38 



Beryllium oxide, BeO „ 12-28 



Cerium sesquioxide, Ce o 3 2-50 



Lanthanum sesquioxide, La 2 3 ) 



Didymium sesquioxide, Di„0 3 \ 



Yttrium sesquioxide, Y 2 3 33-40 



Magnesia, MgO _ -69 



Ignition, loss, IIe,H,N,CO„ -32 



101-20 

 Specific gravity, 4-14. 



2. Geological Survey of Western Australia. The Prospects, 

 of Obtaining Artesian Water in the Kimberley District / by R. 

 Logan Jack. Bulletin No. 25, pp. 35, with a geological map. 

 Perth, 1906 (Fred. Wm. Simpson, Government Printer). — The 

 geological formations represented in Kimberley are Silurian or 

 Cambrian metamorphic rocks ; Devonian sandstone, grit, and 

 limestone ; Lower Carboniferous limestone ; and Upper Carbon- 

 iferous sandstone. Granite is present, which „evidently represents 

 the ultimate stage of metamorphism of the sedimentary rocks," 

 and large areas of Tertiary basalts are mapped. Nine small areas 

 were found to offer favorable conditions for artesian wells. The 

 geological map accompanying this report, on a scale of 12 miles 

 to the inch, includes the work of previous observers and brings 

 the geological information down to date. h. e. g. 



3. JVeio Zealand Geological Survey ; J. M. Bell, Director. 

 The Geology of the Area Covered by the Alexandra Sheet, Central 

 Otago Division (including the survey districts of Leaning Rock, 



Tiger Hill, and Poolburn) ; by James Pake. Bulletin No. 2, 

 pp. 49, with 23 illustrations, 17 photographs and 8 maps. — The 

 second volume issued by the newly organized Geological Survey 

 of New Zealand fulfills the promise of continued high grade work 

 set by the first bulletin (this Journal, xxii, 542). Central Otago 

 seems to be an unusually good field for the study of mountain 

 building and physiography. A peneplain is well developed upon 

 which Mount St. Bathans and Mount Ida stand as monadnocks. 

 "This peneplain can still be clearly traced throughout eastern 

 Otago from the main divide to the eastern shore. ... It is 

 tilted and slants gently from the alpine ranges to the southwest." 



