XV 



BRITISH STRATIFIED SYSTEMS, 



TO WHICH THE FOLLOWING SKETCHES MORE ESPECIALLY REFER. 



The subjoined tabulation exhibits the arrangement of the British stratified 

 rocks, as accepted by our leading geologists minor and local deviations 

 of superposition being subordinated for the sake of distinct comprehension 

 and ready reference : 



Systems. 



Groups. 



Periods. 



CALNOZOIC. 



MESOZOIC. 



In progress. 



Recent. 



Pleistocene. 



Pliocene. 



Miocene. 



Eocene. 



Chalk. 



Greensand. 



Wealden. 



Oolite. 



Lias. 



Saliferous Marls. 



Muschelkalk (1) 



Upper New Red Sandstone. 



Magnesian Limestone. 



Lower New Red Sandstone. 



Coal-Measures. 



Millstone Grit. 



Mountain Limestone. 



Lower Coal-measures. 



Yellow Sandstones. 



Devonian Limestones and 

 Slates. 



Red Sandstones, Conglom- 

 erates, and Cornstones. 



Grey fissile Sandstones 

 ("flagstones ") and Con- 

 glomerates. 



Upper Flags, Shales, and 

 Limestones. 



Lower Grits and Slates. 



Slates, Schists, and Grits. \ 



Gneissic Schists, Quart- fEozoiC, 

 zites, and Serpentines. / 



PALEOZOIC. 



