1869.] 



WHITAKER SOUTH-DEVON " NEW RED. 



155 



It would be a work of time and trouble to measure the thickness 

 of each division ; perhaps, indeed, it would be impossible to do so at 

 all accurately; but I must draw attention to Mr. Pengelly's cal- 



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culation (from the dip and breadth of outcrop), according to which 

 the whole formation may have a thickness of four miles or more *, 



* Trans. Plymouth Inst, for 1862-63, pp. 28^0, and for 1864-65, pp. 40-46, 

 and Trans. Devon. Assoc, of Lit. Sci. & Art for 1863. 



