90 Revieivs — Block Mountains in Northern Nelson. 



latent possibilities . . . transmitted to the various groups and sub- 

 groups, and expressed in a definite order whenever the appropriate 

 environmental stimulation was present ". This definite order in 

 the succession of the morphic stages is represented in a table under 

 the heading " Orthogenesis ", but why this somewhat metaphysical 

 term should be used is not apparent, for it is not easy to see how 

 the order could have been any other. Another table shows how well 

 the classification agrees with the known stratigraphical distribution, 

 except as regards the Ponderosa group. 



We hope that Miss McEwan will continue her studies, and that 

 she will have the oj)portunity of extending them to European 

 material. FAB 



Block Mountains and a Fossil Denudation Plain in Northern 



Nelson. By C. A. Cotton, D.Sc, Victoria University College, 



WelUngton. Trans. New Zealand Inst., vol. xlviii, 1915, 



pp. 59-75. 



rpHIS paper was written prior to " Block Mountains in New 



-*- Zealand " (by the same author), in which the subject of block 



mountains is treated more fully. 



The district examined here is a very small one, the Vviiter con- 

 fining his attention to the " Aorere-Gouland Depression " and the 

 " Gouland Downs Depression ", but the theories advanced serve 

 ' as a working hypothesis which gives much assistance in the inter- 

 pretation of this particular district. It would appear that the 

 relief which the deformed undermass presumably had in some earlier 

 period had been almost entirely destroyed f)rior to the deposition 

 of the covering strata. After the period of deposition of the covering 

 strata, there occurred strong differential movements which sketched 

 out the broad outlines of the land forms of the present day, led to 

 the formation of many consequent rivers, and inaugurated the 

 cycle of erosion in which the majority of the details of the surface 

 were developed. This is quite a departure from the interpretation 

 given by Bell in his Parapara bulletin, in which he supposes that 

 maturely dissected mountains occupied the area in the period 

 immediately preceding that in which the covering strata were laid 

 down, and the period of deposition was one of only partial sub- 

 mergence. 



Preliminary Eeport on the Economic Geology of Hazelton 

 District, B.C. By J. J. O'Neill. Department of Mines, 

 Geological Survey of Canada, Memoir 110. 1919. 



rpHIS report, though short, is somewhat diffuse. It deals with the 

 -"- mines of an area of 225 square miles, situated 130 miles north- 

 east of Prince Ruj)ert. The region is described as consisting of folded 

 Upper Jurassic sediments with interbedded tuffs and tuff- 

 agglomerates, invaded by batholiths of granodiorite and " small 

 batholiths " and dykes of " granodiorite-porphyry ". 



