No. 541. 



Decade V.— Vol. VI.— No. VII. 



Price Is. 6d. net. 



THE 



GEOLOGICAL MAGAZINE 



JHonthlj) Journal af ^eologg. 



WITH WHICH IS INCORPORATF.I) 



THE <3-EOI_.OC3-IST. 



EDITED BY 



HENRY WOODWARD, LL.D., F.R.S., F.G.S., &c. 



ASSISTED BY 



Dr. GEORGE J. HINDE, F.R.S., &c., and HORACE B. WOODWARD, F.R.S., &c. 



JULY, 1909. 



OOnSTTEH^TS 



I. Original Articles. Fage 



Geology of the Lower Coal-measures 

 of Derbyshire and Nottinghamshire. 

 By Egbert D. Vernon, B.Sc, 

 University College, Nottingham. 

 (With three Text-figures.) 289 



The Petrology and Intrusions of the 

 Kilsyth-Croy District, Dumbarton- 

 shire. By G. W. Tyrrell, 

 A.R.C.Sc, Glasgow University. 

 (Plate XII and Fig. 1 in text.) ... 299 



The Jurassic Ganoid Fish, Thurophol'is 

 Itevissima, Egerton. By Miss Mary 

 S.Johnston. (Plate XIII.) ...309 



"Wells of the North-Easteru Sudan. 

 By G. W. Grabham, M.A., F.G.S. 

 (With a Map.) (Concluded from 

 the June Number.) 311 



II. Reviews. 



The San Francisco Earthquake. 



Carnegie Institution, Washington. 319 

 The Stone Ages in North Britain and 



Ireland. By the Rev. F. Smith ... 321 



Pfiffe 



Brief Notices : The New Zealand 

 Geological Survey — The University 

 of Durham Philosophical Society- 

 Earth Tides — F. P. Mennell's 

 Miner's Handbook— Mineral Dis- 

 coveries in South Australia — The 

 Formation of Geodes — Vegetation 

 of British Peat Mosses 322 



III. Reports and Proceedings. 

 Geological Society of London — 



May 12, 1909 32;5 



May 26 327 



V. Obituary. 

 Thomas Mellard Reade, F.G.S. ... 333 



VI. Miscellaneous. 

 Burning Cliff, Lyme Regis . . . .^. _336_ 



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^^ The Volume for 1908 of the GEOLOGICAL MAGAZXKE. is ready, 

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