CHAPTER VIII. 



Upper Gondwana. 



Rajmehal Group* {Lower Jurassic). 



In the Palceontologia Indica, a general section, compiled from a 

 number of different observations at different localities, is given to show 

 the general character of the sequence of the Rajmehal beds and their 

 associated traps, rather than to indicate the actual state of things which, 

 we should be justified in assuming, actually exists in any one place. 

 Indeed, it is well known that many of the beds have only a local dis- 

 tribution, " flows of trap being sometimes intercalated in the sedimen- 

 tary deposits and shales or sands in the traps/' While quoting this 

 section, it will be necessary in this report, which is intended to furnish a 

 somewhat more detailed account, to give in full the data from which it 

 was constructed. For further comparison, some sections which were 

 subsequently measured will be also added. 



General Section {Descending). 



1. Basalt, very compact. 



2. Hard quartzose grit. 

 1 3. Trap, compact. 



3a. Trap, softer and more largely crystalline. 



4. Beds of white shales and sandstones. 



5. Trap, olivinic. 



6. Similar to No. 4, but without sandstone. 



7. Columnar basalt. 



8. Black carbonaceous shale. 



9. Trap, columnar. 



10. Sandstone, coarse and ferruginous. 



11. Trap, generally soft, rather earthy and abounding in olivine. 



* A considerable portion of this chapter has already appeared together with the 

 description of the fossils by Dr. Oldham and Prof. Morris, Palceontologia Indica, II. My 

 attention during the season I spent in the Rajmehal hills was more particularly devoted 

 to the older formations. 



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