PRICE, WITH SUPPLEMENT, ONE SHILLING- AND SIXPENCE. 



VOL. IV. APRIL, 1861. No. 40. 



THE GEOLOGIST; 



AN ILLUSTRATED 

 POPULAR MONTHLY MAGAZINE 

 or 



GEOLOGY. 



EDITED BY S. J. MACKIE, F.G.S., F.S.A. 



" Geology, in the magnitude and sublimity of the objects of which it treats, 

 undoubtedly ranks in the scale of the sciences next to Astronomy." — Herschell : 

 Discourse on Study of Natural Philosophy. 



LONDON: 



PUBLISHED AT THE OFFICE OF THE GEOLOGIST, 

 25, GOLDEN-SQUARE, REGENT-STREET, W. 



EAILLIERE, BROTHERS, 400, BROADWAY, NEW YORK; B. DAWSON & SONS, 



MONTREAL. 



MESSRS. J. B. BAELLIERE ET FILS, RUE HADTEFEUILLE, PARIS. 

 C. BAILEY BAILLIERE, OALLE DEL PRINCIPE, MADRID. 



FEINTED AT THE GEOLOGIST OFFICE, 22, SOUTHAMPTON-STREET, STRAND, LONDON, 



