430 Correspondence — Rusticus. 



such is the case at Halesfield. Should it be so, it would establish the 

 fact of there being two systems of faults in point of age affecting 

 the Coal-measures in this Coal-field, which has not, I think, been 

 pointed out by any previous writer upon the subject. I had not 

 supposed that my conclusions were different from those of most other 

 geologists ; but I have fallen into the error of supposing that Mr. 

 Eandall thought in any way differently on the general subject. The 

 reference, however, to a local exception, is equally new to me ; and 

 therefore I should be obliged for information on the subject. It will 

 be necessary to show that there are faults in that neighbourhood 

 which affect the older Coal-measures, without affecting the younger, 

 which fill the denuded valley. I take this opportunity of saying 

 that I am indebted entirely to Mr. Scott for the lines showing the 

 denudation of the several groups of Coal-seams from near the Hem 

 pit northwards. Daniel Jones, F.G.S. 



ON THE SUBMERGENCE OF THE WEST COAST OF BRITTANY. 



Sib, — In connexion with Mr. Lebour's paper on the submergence 

 of the western coast of Brittany (see above, p. 300), and the Eev. 

 T. G. Bonney's reference to M. Quenault's book treating of the 

 subsidence of the coast of Normandy (see above, p. 384), I beg to 

 call your attention to the elaborate and conscientious collection of 

 " physical and historical evidences of vast sinkings of land on the 

 north and west coasts of France and south-western coasts of 

 England within the historical period," by Mr. K. A. Peacock, C.E. 

 (8vo., Spon, London, 1868.) Although the western coasts of 

 Brittany (comprising Is) are not specially treated of, yet a vast 

 amount of relative information is afforded by Mr. Peacock's work, 

 and some of M. Quenault's labours, alluded to by Mr. Bonney, are 

 given in detail at pages 131-133. 



Mr. Peacock's "collected evidences prove that within the last 

 nineteen centuries, and even so late as the beginning of the fifteenth 

 century, large tracts of land and sea-bottom have sunk, even more 

 than a hundred feet at some places, along the coasts of Western 

 Prussia, Holland, and Belgium, from the Elbe to near Nieuport ; 

 along the coasts of North Somerset, and of Devon and Cornwall, 

 north and south ; in the bed of the English Channel ; amongst the 

 Channel Islands ; along the coasts of Normandy and Brittany, from 

 the Seine to Portrieux ; on the north coast of Brittany, from about 

 Lannion to the north-west angle of Brittany ; around the Isle of Sein, 

 on the west of Brittany ; and probably also along the French coast 

 in the Bay of Biscay. Whilst possibly the land around Eochelle has 

 risen a few feet since the commencement of the twelfth century." 

 (Phil. Mag. for May, 1869.)— ^Yours, etc., Eusticus. 



TERRACES OF NORWAY.^ 



Sir, — I have endeavoured to follow Mr. Marshall Hall's advice 



(Geol. Mag., July). But I found that there were many Aardals in 



Norway. I have been to that a little north of Stavanger. I found 



plenty of terraces, and my walk up the valley ended at a magnificent 



1 See Geol. Mag., 1871, Vol. VIII., p. 75. 



