NOTES ON' CRICH HILL. 47 



200 yards, and then N-E. I have said that the strata in Crich Hill 

 form a sort of elliptical dome. Perhaps the best way to obtain a 

 mental picture of the beds, is to imagine a series of pie dishes 

 without rims, fitting into one another like a nest of Japanese 

 boxes. The whole series is inverted, forming a dome, in which 

 the different dishes represent different beds of rock. In making 

 a horizontal tunnel through the series of dishes we should pass 

 through successive dishes, from the outer one to the innermost 

 one, and having reached the centre pass through the opposite 

 sides of the same dishes, but in the reverse order. This illustrates 

 the way in which we passed through successive beds of rock in 

 Crich Hill, proceeding through outer or upper beds to inner or 

 lower ones, and then through some of the lower ones again, until 

 we reached the toadstone at the opposite side. 



Diagrammatic Section through Crich Hill. 



The following beds are shewn : — 



We passed through beds of massive limestone, dipping about 

 45° W. or S-W., and various beds of clay, one of wiiich is three or 



