Geology. 561 



division, Hauraki, Auckland/ by J. Henderson, assisted by 

 J. A. Bartrum. Wellington, 1913. Pp. 127, pis. I-X, 7 dia- 

 grams, 10 maps and sections. — This Bulletin No. 16, taken in 

 connection with Bulletins Nos. 4, 10 and 15, completes the 

 detailed mapping of the mining areas of Hauraki, Auckland. Of 

 the 662 square miles included in the Aroha subdivision 250 are 

 forested with Kauri and other timber. In this latitude (about 

 37° ±S.) Kauri and mangrove find their southern limit and the 

 factors controlling their distribution offer a fascinating ecologic 

 problem. 



Four major earth blocks have resulted from movements in late 

 Tertiary and recent times, — movements which are responsible for 

 the larger topographic features present. To the physiographer 

 the complicated history of the streams traversing the Hauraki 

 plain affords an excellent example of the changes induced by 

 uplift and tilting. 



The formations represented in the Aroha ai*ea are : (1) Recent 

 and Pleistocene, river and estuarine deposits ; (2) Tertiary, 

 rhyolites and dacites and andesites, with fragmental deposits of 

 several types and including lignite ; (3) Jura-Triassic grauwackes 

 and argillites. The Tertiary volcanics are fully discussed in a 

 desci'iption which includes microscopic and chemical analyses. 

 The gold and the silver bodies of this prosperous mining dis- 

 trict " owe their formation to secondary concentration, by 

 descending meteoric waters ... of masses of pro- 

 pylitized rock." The controlling factors appear to be the degree 

 and extent of the area of propylitization and the topography of 

 the mining area. h. e. g. 



Seventh Annual Heport, 1912-13, Appendix C. Pp. 115- 

 142, 3 maps. — The Director of the New Zealand Survey announces 

 that two paleontologic papers : Materials for the Paleontology of 

 New Zealand by Dr. J. Allen Thompson and Revision of the 

 Tertiary Mollusca of New Zealand based on type material by 

 Henry Sutor, are soon to appear. It is also announced that the 

 fossil fauna and flora of Cretaceous, Jurassic and Triassic age, 

 and also the Paleozoic faunas, are at present under examination by 

 specialists in Europe and Australasia. Among the special reports 

 included in Appendix C are: The Coal Possibilities of Westport 

 Flats, by P. G. Morgan, and Geology of the Te Puke District, by 

 J. A. Bartrum. h. e. g. 



6. Mountains. Their origin^ growth, and decay ; by James 

 Geikie. Pp. xix, 311; pis. 80, 'figs. 57. New York, 1914 (D. 

 Van Nostrand Company). — This work, as stated by the author, 

 deals with the borderland of geology and geography, the main 

 subjects discussed being the architecture and origin of mountains. 

 Technicalities are largely avoided with the intention of making 

 the volume available for general reading. In conformity with 

 this end the plates are largely photographs, excellently chosen 

 and reproduced, and diagrams are also abundant as text-figures. 

 Considerable space is given to the architecture of the Alps, 



