132 Reviews — The Building Stones of Queensland. 



VII. — The Building Stones of Queensland. By H. C. Bichards. 

 Proc. Boy. Soc. Queensland, vol. xxx, JN T o. 8, pp. 97-157, 1918. 



IN the Official Year Book of Australia for 1916 it was found 

 necessary to remark that "there is not sufficient information 

 available to permit of a detailed statement ... in regard to the 

 quantity and quality of Queensland Building Stones". This 

 reproach is now largely removed by Dr. Bichards, who has given 

 in this paper the geological and physical characteristics of the 

 stones available for constructional purposes. Numerous chemical 

 analyses are quoted, and tables showing the resistance to crushing, 

 specific gravity, absorption coefficient, etc., of many of the rocks, are 

 provided. The paper contains many details of petrographical interest 

 and is illustrated by eighteen photomicrographs. 



VIII. — Beport on the Clay Besources of Southern Saskatchewan. 



By N. B. Davis. Canada, Department of Mines, pp. 93, with 



21 plates, 1 figure, and 2 maps. Ottawa, 1918. 

 rnHE Province of Saskatchewan contains abundant and excellent 

 JL deposits of fireclay, and of clays suitable for the manufacture 

 of all kinds of ceramic ware, especially bricks and tiles, a fact of 

 much importance in a region devoid of building stone and with 

 little timber. The most valuable clays are found in the lower and 

 middle divisions of the Port Union formation, of Eocene age, 

 associated with silts, sands and lignite, the best of all being in the 

 White-mud series. The Pleistocene and Becent deposits also include 

 beds of clay suitable for making common bricks. In this report 

 a very full account is given of the technology and properties of the 

 clays with records of numerous tests, and a detailed description of 

 the manner of occurrence and thickness of the beds in a great 

 number of localities. 



IX. — On the Intrusion Mechanism of the Arch^an Granites of 

 Central Sweden. By P. Geijer. Bull. Geol. Inst. Univ. 

 Upsala, vol. xv, pp. 47-60, 1916. 



THE older and younger Archaean granites of Central Sweden show 

 characteristically different relations to the rocks invaded by 

 them, the earlier intrusions being to a large extent connected with 

 anticlinal structures, while among the younger batholiths two types 

 can be discerned, the anticlinal and the transgressive. The former 

 resemble in this respect the older gneissic granites, while the others, 

 the Serarchsean granites of Hogbom, furnish excellent examples of 

 the features quoted by Daly in favour of the hypothesis of intrusion 

 by overhead stoping. Many of these stoped batholiths occur in 

 regions characterized by plateau structure, as defined by Harker ; 

 in others this relation is not so typically developed, but the structural 

 relations are always those of the zone of fracture, with regional 

 subsidence and faulting, in strong contrast to the conditions con- 

 trolling the development of anticlinal batholiths which are associated 

 with strong contemporaneous folding and compression of the 

 surrounding stratified rocks. 



