350 



THE GEOLOGIST. 



taceous formation in which Ammonites existed, these seas 

 occupied in France and in the whole of Europe an extension 

 at least double that which they possessed at the period of 

 their first appearance with the Neocomien formation. 



REVIEWS. 



" Etudes Geologiques dam les Alpes,'^ by M. L. A, Necker, 

 8vo. Paris, Langlois et Leclerc. 



The work to which we now purpose calling the attention 

 of our geological friends, is one which adds not only a vast 

 number of facts referring to the theory of glaciers, but also 

 to the more legitimate departments of practical geology. 

 We find in this work geological notices extending throughout 

 the Tarantaise, Little St. Bernard, the neighbourhood of the 

 lakes of Como, Geneva, and Lugano, and the vallies of Se- 

 riana, Camonica, Trompia and Adige; then, again, others 

 relating to the districts between Carinthia and Central 

 Switzerland, as well as the Tyrol, from Trieste through Car- 

 niola. In addition, it contains numerous details with refer- 

 ence to the passes of the Grunsel, Saint Gothard, Splugen, 

 and Grundelwald, and the vallies of Saint Nicolas and 

 Saas. 



Thus much for the sphere of action to which M. Neck- 

 er's " Etudes Geologiques extend, and to which we must 

 necessarily refer such of our readers as desire explicit infor- 

 mation upon the various parts. 



As being amongst the most interesting portions of the 

 work, we would direct attention to the description of the 

 diluvial formations of the neighbourhood of Geneva, conside- 

 rations deduced from notes on the stratification and struc- 

 ture of the sand-l^eds at the confluence of the Arve and 



