Correspondence. 



419 



Section of Strata at ChowJceedanga Colliery. 

 Feet. Inch. 



12 0 Sandy soil mixed with kunkur. 



6 0 Very soft brown sandstone. 



1 0 Very hard ditto ditto, (called " live stone" by the 



natives). 



4 0 Very soft ditto ditto. 



8 0 Tolerably hard ditto ditto. 



10 0 White sandstone, intersected by dark brown veins. 



5 0 Shale. 



5 0 1st Coal bed, inferior quality. 



0 2 Shale. 



5 0 2nd Coal bed. 



0 9 Shale. 



5 0 3rd Coal bed. 



7 0 White sandstone. 



2 0 4th Coal bed. 



Total 70 11* 



To the Editor of the Calcutta Journal of Natural History. 

 Dear Sir, 



We too frequently refrain from seeking interesting, if not useful in- 

 formation, from those who are alone able to impart it, from a natural, 

 but I think censurable, reluctance to expose our own ignorance, or 

 otherwise from a fear that our enquiries may prove to refer to objects 

 either too trifling to merit attention, or too common to be unknown to 

 any soul, with eyes and common sense, but our own individual selves. 



Under this fear, we frequently lose both interesting and useful in- 

 formation, and that in many instances, from those who might casually 

 add to their own knowledge whilst removing a portion of our ignorance. 



* To render sections of this nature complete, the dip, the joinings, the mineral, economic, 

 and the organic characters of each bed should be noticed in full detail, for every bed has its 

 own peculiar characters by which it may be distinguished and recognised wherever it be met 

 with, and under whatever form of metamorphoses it may occur. Excellent examples of the 

 method of describing rocks, and distinguishing them by means of their fossil contents, etc. 

 will be found in our notices of Mr. Murchison's work, contained in former Nos. of this 

 Journal.— Ed. 



