THE 
GEOLOGICAL MAGAZINE: 
or, 
Monthly Journal of Geology: 
WITH WHICH IS INCORPORATED 
Pre GHOLOG TS ts 
NOS. CLXXXVII. TO CXCVIII. 
EDITED BY 
HENRY WOODWARD, LL.D., F.R.S., F.G.S., F.Z.8., F.R.MS., 
OF THE BRITISH MUSEUM; 
(NATURAL HISTORY, ) 
MEMBER OF THE LYCEUM OF NATURAL HISTORY, NEW YORK; AND OF THE AMERICAN 
PHILOSOPHICAL SOCIETY, PHILADELPHIA ; HONORARY MEMBER OF THE YORESHIRE 
PHILOSOPHICAL SOCIETY; OF THE GEOLOGISTS’ ASSOCIATION, LONDON; 
OF THE GEOLOGICAL SOCIETIES OF EDINBURGH, GLASGOW, 
AND NORWICH; CORRESPONDING MEMBER OF THE 
GEOLOGICAL SOCIETY OF BELGIUM; AND 
OF THE NATURAL HISTORY SOCIETY 
OF MONTREAL, 
ASSISTED BY 
PROFESSOR JOHN MORRIS, M.A. F.GS., &., &ex 
AND 
ROBERT ETHERIDGE, F.R.S.L. & E., F.G.S8., &c. 
PRESIDENT OF THE GEOLOGICAL SOCIETY OF LONDON, 
NEW SERIES. DECADE II, VOU. VII. 
JANUARY—DECEMBER, 1880. 
LON DO Nz 
TRUBNER & Co. 57 ann 59, LUDGATE HILL. 
F. SAVY, 77, BOULEVART ST.-GERMAIN, PARIS. 
1880. 
