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REPORT OF NATIONAL MUSEUM, 1892. 



from European text-books of geology, and is intended to represent tlie 

 scale as it is now generally accepted and approved by geologists. It 

 will of course be understood that only a general outline of the great 

 scale which has been established by the concurrent labors of European 

 geologists is represented by these tables, but they are deemed sufficieDt 

 for illustrating the following remarks and discussions. 



Condensed scale of the fossilifcrous rocks, No. I, 1840.* 

 Recent and Postpliocene. 



Pliocene ) 



Miocene I Tertiary. 



Eocene 



Maestricht 



White Chalk 



Chloritic Series 



Gault 



Neocomian 



Cretaceous 



Wealden 



Pnrheek Beds 



Portland Stone. . . 

 Kiinmeridge Clay . 



Coral Rag 



Oxford Clay 



Great Oolite.- 



Inferior Oolite . . . 

 Lias 



1 Jurassic . 



Secondary. 



Upper New Red Sandstone , Triassic . 



Lower Xew Red Sandstone Permian 



Coal Measures ) 



Mountain Limestone \ Carboniferous 



Old Red Sandstone Devonian \ Primary. 



Upper Silurian i 



Lower Silurian 



Cambrian? . ... Cambrian .' 



Condensed scale of the fossiliferous rocks, No. ..', J890, 

 Recent and Postpliocene. 



Pliocene . . 

 Miocene.. 

 Oligocene 

 Eocene... 



■1 



Tertiary Cenozoic. 



*At the date here indicated there was much difference of opinion as to the proper 

 method of dividing the scale. This table is intended to represent the leading 

 opinion, mainly as expressed by Lyell. 



