RECENT ADVANCES IN SCIENCE 639 



A re-examination of the north-western part of Charnwood 

 Forest has convinced Prof. T. G. Bonney that he formerly 

 assigned a pyroclastic origin to too many of the rock-types, 

 as at Bardon Hill (Geol. Mag. 191 5 (6), 2, 545). The structures 

 formerly interpreted as pyroclastic are now regarded as due 

 to flow-brecciation in the lavas. 



At the other end of the geological time-scale, the Danbury 

 (Essex) gravels have been investigated by Prof. J. W. 

 Gregory (Geol. Mag. 191 5 (6), 2, 529), who remarks on the 

 abundance of quartzite pebbles foreign to the district, and on 

 the absence of materials such as Jurassic sandstones, large 

 unworked flints, and basalt, which are common in the Essex 

 glacial gravels. These facts support the hypothesis of fluviatile 

 origin and the Pre-Glacial age of the Danbury deposits. 



In a paper on the Carrara marble district, Dr. du Riche 

 Preller {Geol. Mag. 191 5 (6), 2, 554) re-affirms the Mesozoic 

 age of the marbles, in opposition to the views of Prof. Bonney. 

 They form an integral part of the Lower Mesozoic rocks of the 

 Apuan Alps, and are in no way associated with, or contem- 

 poraneous with, the older schists of the district. 



The Cordilleran geology of British Columbia is greatly 

 furthered in recent Memoirs of the Canadian Geological Survey, 

 which, whilst primarily dealing with economic geology, also 

 describe the general geology of these interesting mountain 

 areas (Memoir 58, Texada Island, B.C., by R. G. McConnell ; 

 Memoir 68, A Geological Reconnaissance between Golden and 

 Kamloops, B.C., along the Canadian Pacific Railway, by 

 R. A. Daly ; Memoir 56, Geology of Franklin Mining Camp, 

 B.C., by C. W. Drysdale ; Memoir 76, Geology of Cranbrook 

 Map-Area, B.C., by S. J. Schofield ; and Memoir 79, On 

 Deposits of the Beaverdell Map-Area, by L. Reinecke, 191$). 

 The primary feature in all these areas is the prevalence of 

 great batholiths of granitoid rocks, with which the mineralisa- 

 tion is frequently connected. The same type of country, but 

 farther to the north-west, is dealt with in two publications of 

 the Canadian Geological Survey (Memoir 50, Upper White 

 River District, Yukon ; and Memoir 67, The Yukon-Alaska 

 International Boundary between Porcupine and Yukon Rivers, 

 both by D. D. Cairnes). The United States Geological Survey 

 has also been active in Alaska, as witnessed by the recent 

 publication of two bulky memoirs (Professional Paper 87, 



