164* Mr. R. Griffith on Mr. Weaver's Paper relative 



As to the term old red sandstone, I agree with most others 

 in thinking it objectionable ; but if this rock occurs in similar 

 positions and presents similar mineral characters in the west 

 of England, in Scotland, and in Ireland, a local name, as 

 " Devonian," cannot be considered suitable, and the provin- 

 cial term killas, recommended by Mr. Greenough, though 

 preferable, as not indicating any particular locality, does not 

 appear to be applicable to a general series of rocks. 



But I am forgetting the object of this communication, and 

 must return to Mr. Weaver. In common with all geologists 

 connected with Ireland, I feel much indebted to him for his 

 laborious investigations in that country; and although I 

 differ from him in many most material hinging points, still 

 1 fully admit that he has effected much that is accurate and 

 valuable. Entertaining such feelings towards him, I regret 

 to find that he has not entered upon the discussion of the 

 differences between our respective geological labours with the 

 fairness I should have expected, as, in making his strictures 

 on my geological maps and papers, he has compared the ex- 

 planation which accompanied the production of my large 

 geological ?nap, with the small one and the " Geological Out- 

 line " appended to the Railway Report. As my large geologi- 

 cal map was exhibited at the meeting of the British Association 

 at Newcastle in 1838, at the time I read my paper on the 

 geological structure of the south of Ireland, and as in that 

 paper I mentioned the change that I had made in relation to 

 the old red sandstone series of the southern counties, Mr. 

 Weaver in considering that paper should have referred to 

 the map which it was meant to illustrate, and not to the small 

 geological map, the discrepancies in the colouring of which, 

 as already expressed, it was intended to correct. Similar 

 observations are applicable to the papers, also referred to 

 by Mr. Weaver, read before the Geological Societies of 

 London and Dublin, in May and June, 1839, both of which, 

 as mentioned in the commencement of those papers, were 

 communicated on the presentation of a copy of my large geo- 

 logical map, published in March of the same year. 



Instead of comparing these several papers, all of which 

 refer to the geological structure of the south of Ireland, with 

 the large geological map, Mr. Weaver has compared them 

 with the small map, and the " Geological Outline " which 

 accompanied it; we need not therefore be surprised at his 

 observing differences and incongruities, and through them 

 attempting to throw discredit on everything which I have 

 done. 



It is true that Mr. Weaver has 1 introduced notes in several 



