No. 667. 



Vol. LVII of Whole Series. 



Price 2s. 6d. 



NH 



The 



icOlOHlCal ificlS'clZ106 



HDontbl^ 3ournal of (Beolog^* 



WITH WHICH IS INCORPORATED 



THE GEOLOGIST, 



EDITED BY 



HENRY WOODWARD, LL.D., Y/R.S 



R. H. RASTALL, M.A. 



ASSISTED EV 



^mxme^-' 



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



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



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



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



JANUARY, 1920. 



CONTENTS :— 



Editorial Notes. 



Page 

 .. ' 1 



Original Articles. 



An Inverted Mass of Upper Cre- 

 taceous Strata near Leighton 

 Buzzard. By F. L. KiTCHiN and 

 J. Pringle. (With 3 Text- 

 figures.) 4 



Pre - Triassic Swallow - holes in 

 Furness. By B. Smith 16 



Brachiopod Nomenclature. By 

 S. S. BUCKMAN 18 



On the Distribution of ProdiLctus 

 liimerosus. By T. F. SiBLY ... 20 



The Pygidium of the Trilobite. 

 By P. E. PiAYMOND 22 



The Ammonite Siphuncle. By 

 A. E.Trueman. (With 2 Text- 

 figures.) 26 



Angra Pequena and Subserial 

 Denudation. By E. F. Band ... 32 



liEVIEWS. 



Page 



Summary of Progress of the Geo- 

 logical Survey 36 



Haematites of Furness 37 



Unbedded Iron Ores 38 



Hematites of the Forest of Dean 



and South Wales 39 



Recent Geophysical Pieprints 40 



The Channel Islands 41 



Antarctic Brachiopods 42 



Petrology for Students 43 



Palaeontology (Invertebrate) 44 



Repokts and Proceedings. 



Geological Society of London 44 



Geologists' Association 46 



Liverpool Geological Society 46 



Correspondence. 



J. Allan Thomson 47 



E. H. Cunningham-Craig 48 



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