w 



■■1 a'' 



<^ ^ C^ 'U J 



K. 



THE 



^ CtEOLogical magazine 



riDoiitblv) 3ournal of (Bcoloo^. 



WITH WHICH IS INCORPORATED 



THE GEOLOGIST. 



Founded in 1864 by the latk Dk. Henry Woodward, F.R.S. 



EDITED BY 



R. H. RASTALL, Sc.D., M.Inst M.M., 



UNIVERSITY LECTURER IN ECONOMIC GEOLOGY, CAMBRIDGE 



ASSISTED BY 



Peofessor J. W. GREGORY, D.Sc, F.R.S. 



F. H. HATCH, Ph.D., M.Inst.M.M. 



Sir T. H. HOLLAND, K.C.S.I., D.Sc, F.R.S. 



Professor J. E. MARR, Sc.D., F.R.S. 



Sir JETHRO J. H. TEALL, Sc.D., LL.D., F.R.S. 



Professor W. W. WATTS, Sc.D., LL.D., M.Sc, F.R.S. 



HENRY WOODS, M.A., F.R.S. 



ARTHUR SMITH WOODWARD, LL.D., F.R.S. 



VOL. LIX OF WHOLE SERIES. ,^^\\^^ lns';V 



JANUARY— DECEMBER, 1922. <> ' ' ' ■) 



LONDON: 



DULAU & CO., LTD., 34-36 MARGARET STREET, 



CAVENDISH SQUARE, W.l. 



1922. 



