No. 676. 



Vol. LVII of Whole Series. 



Price 2s. 6d. 



Th< 



agazme 



HDontblp 3ourual of (5eoloo\)- 



WITH WHICH IS INCORPORATKD 



THE GEOLOGIST. 



SDITED BY 



HENEY WOODWARD, LL.D., F 



E. H. EASTALL 



%^^f.s^^^^^ im^ 



,M.(. OCT20 192M' 



iSSISTKD BY 



[' filiise^^ 



^ 



Pbof. J. W. GREGORY. D.Sc. F.R.S. Sir JETHRO J. H. TEALL, Sc.D., F.E.S. 



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



PROr. J. E. MARR. Sc.D., F.R.S. HENRY WOODS, M.A., F.R.S. 



Dr. A. SMITH WOODWARD, F.R.S. 



OCTOBER, 1920. 



CONTENTS :— 



Page 

 Editorial Notes 433 



Original Articles. 

 Preliminary Notes on the Geology 

 of the Ningi Hills, N. Nigeria. 

 ByG.W. Williams; withPetro- 

 graphical Appendix by E. H. 

 Eastall. (With Folding-map.) 434 



The Existence of Diamond-bearing 

 "Pipes" in Brazil. By E. E. 

 Walls. (Plate VIII.) 447 



The Metamorphism of the Pre- 

 Cambrian Dolomites of Southern 

 Eyre Peninsula, S Australia. 

 By C. E. TiLLEY. (With PI. IX 

 and 2 Text-figures.) 449 



Original Articles (coiit.). Page 

 Investigation of the Mechanical 

 Constitution of Loose Arenaceous 

 Sediments by the method of 

 Elutriation. By H. A. Baker. 

 (With a Text-fig.) {Concluded.) 463 



Eeviews. 



Iron Ores of Scotland 468 



Invertebrate Paleontology 469 



Eeports and Proceedings. 



British Association Abstracts 469 



Correspondence. 



C. Carus-Wilson 474 



Obituary. 

 Wheelton Hind 476 



LONDON: DULAU & CO., Ltd., 84-36 Margaret Street, 

 Cavendish Square, W. 1. 



Cloth Cases for Binding may be had, price 2s. net. 



