1866.] TSri/OK — VALLEY-GRAVELS. 



463 



and as it is found deposited upon the faces of crystals of analcime 

 and apophyllite, it is evident that it must have been formed at a 

 very moderate temperature*. 



April 25, 1866, 

 The following communications were read : — 



1. Additioj^al Documents relating to the Volcanic Eruptions ai 

 the Kaimeni Islands. By Commander Brtne, of H. M.S. ' Eacer.' 



[Communicated by the Lords Commissioners of the Admiralty.] 



(An abstract of this communication was published in Quart. Jourm Greol. Soc- 

 J^o. 87, p. 319, bj order of the Council.) 



2. Report to the Eparch of Santorino on the Eruptions at the 

 Kaimeni Islands. By M. Fouque. 



[Communicated by Sir E. I. Murchison, Bart., K.C.B., F.R.S., F.G.S., &c. 



(An abstract of this communication was published in Quart Journ. Grcol. Soe. 

 J^o. 87, p. 320, by order of the Council) 



3. Remarks upon the Interval of Time which has passed between 

 the Formation of the Upper and Lower Yallet- gravels ofptart of 

 England and France ; with Notes on the Character of the Holes 

 hored in Rocks hy Mollusca. By A. Tylor, Esq., F.G.S. 



The elaborate examination of the Quaternary deposits made by Mr, 

 Prestwich has induced that geologist to divide the vaUey-gravels 

 into upper and lower, which are supposed to be separated from each 

 other by a considerable interval of time. 



There is much similarity in these deposits, although separated for 

 purposes of classification by Mr. Prestwich ; for the organic remains 

 are nearly identical, and the human implements found in both (made 

 of roughly chipped flint) are of the same general character. Mr. 

 Prestwich argues that although the upper vaUey-gravels are at a 



* The following are the chief works on Lake Superior Mine : — 



Foster and Whitney, ' Eeport on the Lake Superior Land District, 



Washington,' 1845, 

 J. D. Whitney ' The metallic weight of the United States.' 

 Eivot, " Voyage au Lac Superieur," Ann. des Mines, 5^ ser. vol. vii. 



p. 175 ; " Notice sur le Lac Superieur," Ann. des Mines, 5^ ser. vol. x. 

 Jules Borie, ' Bulletin de la Societe de I'lndustrie Minerale,' vols. vi. 



vii., viii. 

 Alb. Miiller, ' Verhandlungen der naturf. Q-esellschaft zu Basel,' vol, iiL 



