574 Correspondence — Colonel George Greenwood, 



fore, only tend to confusion." The author next pointed out that 

 pal^ontologicall}'- the Coal-measures of Kilkenny, Queen's County, 

 Limerick, Clare, Kerry, etc., were similar to those of Coalbrookdale, 

 Staffordshire, and other places in England. 



Mr. W. Hellier Baily, F.G.S., gave a list of the fossils common to 

 both the English and Irish Coal-measures. 



Mr. Hull, F.E.S., briefly replied, and referred chiefly to the lower 

 members of the Coal-measures in England, with which he compared 

 the Irish coal. 



The Secretary, Prof. McAlister, exhibited the skull of the grizzly 

 bear (Ursus ferox), found in digging the Ulster Canal. This led to 

 a discussion on fossil bears, after which the Society adjourned. 



coi^iaiBSiE^OD^nDiEn^ciE]. 



EIVER TERRACES, ETC. 



Sir, — I make no remarks on the obliging expressions at the end 

 of the Eev. Mr. Bonney's letter (Geol. Mag., p. 526), but the 

 beginning of his letter is of public and scientific interest. He says, 

 "I certainly did not understand that Colonel Greenwood was speaking 

 solely (Mr. Bonney's italics) of terraces in closed valleys. This, it 

 appears to me, was by no means clearly brought out in his first letter. 

 With regard to these, I can only say that, owing to the general 

 correspondence between all these terraces that I have seen and those 

 in the open valleys, it seems more natural to refer both to the same 

 cause." 



The difference between the two is this, that marine terraces (in- 

 cluding those deposited in " fiords ") cannot be formed without a 

 general cause, that is, without a general subterranean upthrow of the 

 district. "Whereas inland terraces arise from a local cause, that is, 

 flood and deposit caused by rain-water checked at a gorge, and when 

 the gorge, by erosion, is widened and deepened, the alluvium being 

 cut into two jDarallel terraces. 



With regard to my first letter (Geol. Mag., April, 1871) "speaking 

 solely of terraces in closed valleys," the first half of that letter is on 

 marine terraces. The second half begins, " So far in reference to 

 marine alluvial plains," and refers to the difference of the causes 

 of marine and inland terraces. My letter exists in black and white. 

 Has Mr. Bonney written his letter without referring to mine ? 



^"^°°TZ»r'4T"°""' 6^»« GH.EW0OD, Colonel. 



ROYAL COAL COMMISSION. 

 Sir, — In the review of the Eoyal Coal Commission Eeport (Geol. 

 Mag., p. 520, November, 1871) the reviewer has fallen into an error 

 in stating that I reported to the Commissioners on South Staffordshire, 

 East Worcestershire, and Shroj)shire. By reference to vol. i., p. 27, 

 of the Eeport it will be found that Mr. John Hartley, of Tong Castle, 

 Shropshire, reported upon South Staffordshire and East Worcester- 

 shire. My report only refers to the county of Shropshire {vide p. 28), 



