fo. 672. 



Vol. LVII of Whole Series. 



Price 2s. 



The 



riDontblP Journal of (Beologv. 



WITH WHICH IS JNCOHl'OUATKI^ 



THE GEOLOGiST, 



KD1T3CD BY 



HENEY WOODWAED, LL.D., F.E.S. 



2 2 192G 



E. H. EASTALL, M.A. 



-ISSISTKJ) )',V 



Prof. J. W. GREGORY, D.Sc. F.R.S. , Sir JKTHRO J. H. TJCALL, Sc.D.. F.R.S. 



F. H. HATCH, Ph.D., M.Inst.M.M. Prok. W. W. WATTS, Sc.D., F.R.S. 



Peoi?. J. K. MARR, Sc.D., F.R.S. HENRY WOODS, M.A., F.R.S. 



Dr. a. smith WOODWARD, F.R.S. 



JUNE, 1920. 



CONTENTS 



Editori.-\.l Notes. 



Page 

 .. 241 



The Eeport of the Non-Ferrous 

 Mining Committee 243 



OJtIGlNAL AKTICLKS. 



A Recent Worldwide Sinking of 

 Ocean-level. By Professor R. A. 



Daly .' 246 



Note on the Age of the Milburn 



Group. By A. D. N. Bain 261 



Isostatic Measure of the Eocky 

 Mountains. By Dr. Charles 



Keyes '. 262 



The Metamorphism of the Carrock 

 '. Fell Gabbro. By S. Melmoee 266 

 A Fauna from the Lower Chalk, 

 _Eeigate. By G. AV. Butler ... 269 

 r*TheDiatomaceons Earth of Lompoe, 



California. ]]y SirN. Yeemoloff 271 



Reviews. Page 



Structure and Habits of Trilobites. 278 

 Doelter's Handbook of Mineral 



Chemistry 278 



Manganese Ores 279 



Potash in the United States 281 



Iron Ores of Kiruna 282 



The Amisk-Athapapuskow Lake 



District 282 



Kuroko of the Kosaka Copper Mine 283 



Reports and Proceedings. 



The Royal Society 283 



Geologists' Association 284 



Optical Society 284 



Liverpool Geological Society 285 



Correspondence. 



F. L: Kitchin and .T. Pringle 285 



W. T. Ord 287 



G. M. Davies 287 



Obituary. 

 W.R.Billings 287 



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