648. 



Decade VI.— Vol. V.— No. VI. 



Price 2s. net. 



THE 



GEOLOGICAL MAGAZINE 



^louthlD J our mil of (^^eologij. 



WITH WHICH IS INCORPORATED 



'HE G-EOLOG-IST. 



EDITED BY 



HENRY WOODWARD, LL.D.. F.R.S. 



F.G.S. 



&.C. 



ASSISTED BY 



Profkssor J. W. GREGORY, D.Sc, F.R.S., F.G.S. 

 Sir THOMAS H. HOLLAND, K.C.I E., A.R.C.S., D.Sc, F.R.S. , Vice-Pres. 

 Dr. JOHN EDWARD' MARR, M.A., Sc.D. (Came.), F.Q^^.Tffg^if^^ 

 Sir JETHRO J. H. TEALL, i\t a c^ r. fp«»rT, ^ J&.fep., |;.^S. J9lSlS. 

 Profkssor W. W. WATTS^gSS^flifcCSSfesF^^S^. F.G.S. 

 Dr. ARTHUR SMITH WQ(^?ARD, P.R.S., aff^^^SiCE-PRES. JL&ot;.;Soc. 



o o 



I. OuiGiNAL AiiTiCLES. , Page 

 The Genesis of Tungsten Ores. By- 



R. H. Rastall,'m.A., F.G.S. 



[Continued.) 241 



Doloniitization and Leicestershire 



Dolomites. By L. M. PARSONS, 



M.Sc. (Lond.), D.I.C., E.G.S. 



(Plate XI and Map.) 246 



The genus Boiicliardia and Age of 



Seymour Island Beds. By Dr. 



.7. Allan Thomson, M. A., F.G.S. 



(With a Text-figure.) 258 



Notes on the genus Hoiiialonotus. 



By Dr. F. Pi. CowPER Eeed, 



M.A., F.G.S 263 



Mountain Building. By R. M. 



Deeley, M.Inst. C.E., F.G.S.... 276 



II. Notices of Memoirs. 

 A Triassic Isopod Crustacean from 

 Australia. By Charles Chilton. 



1927 



(With two Text-figures.) 



277 



u'^i^3. 



in. Reviews. Page 



Petrography of the Pacific Islands. 



■ ByR. A. Daly 281 



Mineral Industries of United States : 



Sulphur. ByJ. E.Pogue 281 



Pigeon Point, Minnesota. By 



E. A. Daly 282 



Faults in the Californian Coast- 

 range. ByH. O.Wood 282 



IV.. Reports and Proceedings. 



Royal Society 283 



Geological Society of London 284 



Zoological Society of London 285 



V. Correspondence. 

 Ernest Gibson 286 



VI. Obituary. 

 Professor G. A. L. Lebour, M.A., 



D.Sc, F.G.S 287 



Robert Mackenzie Johnston, I.S.O. 288 



>j3i' 



LONDON : DULAU & CO., Ltd., 37 SOHO SQUAEE, W. 1. 



The Volume for 1917 of the GEOLOGICAL MAGAZINE is ready, 

 price 26s. net. Cloth Cases for Binding may be had, price Is. 6d. net. 



