GEOLOGICAL SOCIETY OF LONDON. 



213 



stated to be connected with the extent to which the water 

 in some cases is used for irrigation, it is thought advisable 

 to confine our extract to one set of observations, made in a 

 well at Delhi, the depth being 42 feet : 





T6nip. of wstcr. 



TT'vtATnnl air 

 JCjALdllal dill 





79 



... 76 





76 



.... 62 



1834. 25th Jan. 



74.7 



.... 68 





76.8 





29th Do. 



77 



.... 67 



12th May 





.... 78 













, , . , 82.2 





81.3 



.... 92 



29th Do. . . 









78.61 



77.57 



4. " On the Tertiary formations^ and on their connexion 

 with the Chalk in Virginia, and other parts of the United 

 States/' by Mr, LyelL 



Having examined the most important localities of the cretaceous strata 

 in New Jersey, Mr. Lyell proceeded to investigate the tertiary deposits 

 of Virginia, the Carolinas, and Georgia ; and he states, as the general 

 results of this extensive survey, that the tertiary formations which he 

 saw agree well in zoological types with the eocene and miocene beds of 

 England and France ; that he found no secondary fossils in those rocks 

 which have been called upper secondary, and supposed to constitute 

 a link between the cretaceous and eocene series, but that all the organic 

 remains of these assumed intermediate deposits are characteristic of 

 lower tertiary beds, without any blending of the fossils, which in New 

 Jersey, Alabama, and other states, occur in true equivalents of the creta- 

 ceous system. Mr. Lyell then details the evidence upon which these 

 conclusions are founded. 



Virginia, — Good descriptions of the strata bordering on James River 

 have been given by Professors W. and H. Rogers, and by Mr. Conrad 

 in his excellent work on the tertiary shells of the United States. At 

 Richmond, a bed from twelve to twenty- five feet thick, consists of an 



a 2 



