RECENT ADVANCES IN SCIENCE 373 



Jutson, J. T., The Influence of Salts in Rock Weathering in 

 Sub-arid Western Australia, ibid. 165-72. 



, The Rock-cliffs and Floors of the " Dry " Lakes in 



Western Australia, Geol. Mag. 191 8, 5, 3°5-i3- 



The four papers listed above are a continuation of Jutson's 

 excellent work on the physiographic geology of the sub-arid 

 regions of Western Australia. In them he advances the view 

 that the great " dry lakes " of that country are due mainly to 

 wind erosion. The floors of the lakes are abnormally smooth 

 and level, with billiard-table surfaces of rock especially along 

 their margins. The western boundary is usually a line of 

 steep cliff, on other sides sand tracts and dunes. The cliff 

 boundaries of some of the lakes are rapidly receding under the 

 influence of erosion due to a combination of insolation, exsuda- 

 tion, atmospheric weathering, and wind-erosion. The billiard- 

 table floors are believed to have been produced, concurrently 

 with the recession of the cliffs, by the erosive activity of the 

 wind. Other features of sub-arid erosion, such as the formation 

 of natural quarries, stone fields and pavements, desert-polish, 

 and the process of exsudation (salt-weathering), are considered 

 in this series of papers. 



Kindle, E. M., Notes on Sedimentation in the Mackenzie 

 River Basin, Journ. Geol. 191 8, 26, 341-60. 



Stratigraphical and Regional Geology. — Another part of the 

 Handbuch der Regionalen Geologie has come to hand {Handbuch 

 der Reg. Geol. 191 6, Bd. 3, Abth. 1, 1-12, 213-52), in which 

 Dr. A. M. Davies briefly describes the tectonics and physio- 

 graphy of the British area ; and also deals with the stratigraphy 

 of the Jurassic and Lower Cretaceous of Great Britain. 



Brydone, R. M., The Thickness of the Zone of Belemnitella 

 mucronata in the Isle of Wight, Geol. Mag. 191 8, 5, 35o~4- 



Baker, H. A., On Successive Stages in the Denudation of 

 the Chalk in East Anglia, ibid. 412-16. 



Harmer, F. W., The Stratigraphical Position of the Coralline 

 Crag, ibid. 409-12. 



Howorth, Sir H., The Recent Geological History of the 

 Baltic and Scandinavia, and its Importance in the Post- 

 Tertiary History of Western Europe, ibid. 354-67 ; 397~409 J 

 451-61. 



A memoir by M. E. Wilson on Timiskaming County, Quebec 

 [Geol. Surv. Canada, Memoir 103, 191 8, 197 pp.) is chiefly 



