6 



CORNISH POST-TERTIARY GEOLOGY. 



dlstiact classification.^ He described the St. Agnes and Crousa Down 

 deposits as supra-Cretaceous ; my opinion respecting them is derived 

 from original observations made in Cornwall, Dorset, and Somerset ; 

 from a minute survey of about 800 square miles in Devonshire ; and 

 from the facts, not opinions, of previous and contemporary observers. 

 By accumulating these materials during several years, I have 

 endeavoured to bridge over the gaps in the chain of Post-Tertiary 

 chronology in Devon and Cornwall occasioned by the general 

 absence of the earlier deposits ; but, as negative evidence and 

 I'oasoning from analogies are, in some cases, the only modus 

 operandi, I availed myself of them, and this has laid me open to 

 the charge of entertaining "not very definite" views, brought 

 against me by the Referee, on a subject where very definite views 

 could not be put forward without evoking imaginary deposits, or 

 binding myself to hypotheses which, although I have now strong 

 grounds for entertaining them, might have to be modified, or 

 possibly abandoned, in the light of future discoveries. 



Next, as to my paper on Pleistocene, or Post-Tertiary, phenomena 

 near Padstow. These observations were not included in the larger 

 paper, owing to their extreme importance. In no other part of the 

 South-Western counties has so interesting a collection of Pleistocene, 

 or Post-Tertiary, phenomena been observed within so small a space. 



The Eeferee's remarks on this paper are irrelevant. I have 

 given Mr. Kenwood's notes on the Dunbar (Doombar) submerged 

 ibrest in MSS. for articles in the " Geological Magazine," containing 

 a mass of details not embraced in the papers submitted to the 

 Society. Mr. Hemcood did not observe the old consolidated beach on 

 Dunbar Sands, which is exceedingly interesting, and has, as far as 

 I am awai'e, never been noticed before. 



The Greenway Clifi" section is also exceedingly interesting. If I 



could find a few more sections resembling it, the Referee would have 



less cause to find faidt with the indefinite parts of my classification. 



This observation is quite original ; it stands alone ; and either of the 



hypotheses i:>ut forward to account for it by me are warranted by 



the facts. 



' In the second edition of his Geological Manual (1832), p. 159, a distinct classifi- 

 cation is given by De la Beche, but its application is restricted to the Plymouth 

 raised beach. This classification resembles mine, and would have been mentioned 

 had I noticed it. Although it is not quite relevant. — May 23, 1879. 



