THE 



PHILOSOPHICAL MAGAZINE 



AND 



ANNALS OF PHILOSOPHY. 



[NEW SERIES.] 



OCTOBER 1831. 



XXXII. Researches on some of the Revolutio7is "johich have 

 taken place on the Surf ace of the Globe; presenting various 

 Examples of the Coincidence between the Elevation of Beds in 

 certain Systems of Mountains, and the sudden Changes "which 

 have produced the Lines of Demarcation observable in certain 

 Stages of the Sedimentary Deposits. By L. Elie de Beau- 

 mont*. 



'X'WO great views, one a succession of violent revolutions, 

 -*■ the other the elevation of mountain-chains by forces act- 

 ing from beneath, having been successively introduced into 

 geology, it was natural to inquire if they were independent 

 of each other; if mountain-chains could be raised without 

 producing real revolutions on the surface of the globe ; if the 

 frightful convulsions which must have accompanied the up- 

 burst of masses so great and of an aspect so contorted as 

 those of high mountains, were not the same with those revo- 

 lutions on the surface of the globe which are proved to have 

 taken place by the mineralogical and zoological lines of de- 

 marcation observable in the sedimentary deposits. 



The principal object of the researches, of which the follow- 

 ing is a brief sketch, is to show, term for term, the connection 

 of these two series of facts. 



It will be necessary to premise a few words respecting the 

 principles on which these researches have been conducted. 

 The expression sedimentary deposits {terraiiis de sediment) in 

 which we, in some measure, sum up our knowledge of those 

 masses so widely spread over the surface of our planet, so 



• Extract forwardcil to Mr. De la Beche in May 1831, and communi- 

 cated by tlie latter to tlie Editors. 



N. S. Vol. 10. No. 58. Oct. 1831. 21 naturally 



