No. 663. 



Decade VI— Vol. VI— No. IX. 



Price 2s. 



Th< 



Geological Magazine 



fll>ontbl\> 3ournal of (Beolcujy. 



WITH WHICH IS INCORPORATED 



THE GEOLOGI 



(. 



3DITED BY 



^ SFP 2 9 1919 ^ 



HENKY YVOODWAED, LL.D\f3©.& ,^* 



AND ^*» — ■ 



E. H. EA STALL, M.A. 



ASSISTED BY 



Peof. J. W. GREGORY, D.Sc. F.R.S. | Prop. W. W. WATTS, Sc.D., F.R.S. 



Prof. J. E. MARK, Sc.D., F.R.S. I HENRY WOODS, M.A., F.R.S." ' 



SlE JETHRO J. H. TEALL, Sc.D., F.R.S. Dr. A, SMITH WOODWARD, F.R.S. 



SEPTEMBER, 1919. 



CONTENTS :— 



Page 

 Editorial Notes 385 



Original Articles. 



Eecent Iron - ore Developments. 

 By Dr. F. H. Hatch 387 



A Glaciated Surface in the Hima- 

 layas. By Prof. J. W. GREGORY 397 



Notes on Myriopoda. By J. W. 

 Jackson and others. (Plate IX.) 406 



Brachiopod Nomenclature : Clavi- 

 gcra, etc. By Dr. J. Allan 

 Thomson 411 



The Northern Margin of Dartmoor. 

 By F. P. Mennell 413 



Reviews. 



Palasontograpbical Society 421 



Cretaceous Floras of Queensland... 422 



Reviews (continued). Page 



Ginkgo in Spitsbergen 423 



Iron and Steel Industry 424 



North Riding of Yorkshire 425 



Minerals of South Africa 427 



Rock-forming Minerals in Glass 



Furnaces 427 



Geology of Northern Norway 428 



■ Yorkshire Type Ammonites' 429 



Rhodesian Geology 429 



Correspondence. 



J. W. Jackson and W. E. Allans . 430 



Obituary. 



John Hopkinson. (Plate X.) 431 



P. J. J. Bergeron 432 



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