Featherstonhaugh^s Geological Report. 





Superficial soi 



or present order of nature. 



Feet. 







Upper tertiary or pliocene. 







Tertiary order. < 



Middle tertiary or miocene. 









Lower tertiary or etcene. 







Cretaceous group 3 C 

 deficient in the U. •< 



Upper chnlk, with flints. 







Lower chalk. 



r ^ 



> CD 





States. ( 



Chalk inarl. 



\ ^ 







Upper ^reen sand. 



100 





Subcretaceous group. < 



Gault. 



150 







Lower green sand. 



250 





^Vealden ^roup i de* C 

 ficient in ihe United < 



Weald clay. 



300 





Hastings sand. 



400 





States. C 



Purbeck limestone. 



250 



US 



(' 



Portland oolite. 



120 



o 





Kimmeridge clay. 



500 



to 

 >■ 





Coral rag. 



150 



H 





Oxford clay. 



600 



o 



Oolitic series defi- 



Cornbrash. 



30 



<^ 



cient in the United < 



Forest marble. 



50 



ei 



States. 



Bradford clav. 



50 



o 





Great or Bath oolite. 



130 



o 





Fuller's earth. 



140 



« 

 o 





Inferior oolite. 



180 







Lias, 



500 





f 



Variegated or red marl. 



500 



to 



New red sandstone ! 

 group ; deficiency J 

 not positively as- 

 certained. 



Muschelkalk, 



300 





New red sandstone. 



300 





Zechstein. 



500 







Exeter red conglomerate. 



500 







Bituminous coal measures. 



1,000 





Carboniferous group. < 



Millstone grit and shale. 



700 







Carboniferous limestone. 



850 







Old red sandstone. 



1 10,000 





f 

 1 



Ludlow rocks. 



2,000 





Silurian system. <( 



I 



Wenlock limestone and shale. 



1,800 





Carad(;c beds. 



2,500 





Llandcilo flags. 



1,200 





C 



Upper Cambrian. 







Cambrian svstem. < 



Middle Cambrian. 



r 0 



r 







Lower Cambrian. 



S 







Serpentine. | 



Pi • 



2 





Greenstone rocks. | 



S? O 



« 1 





Talcose slates. | 



o > 





Hornblende rocks. j 



B) Q 



2 o 





Primordial limestone. | 







Mica slate. | 





Gneiss. | 







Granite. | 



N. B. The figures represent the average approximate thickness of some of the beds, 



I 



