^3^' PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



two other localities. The leading objection to its apphcation to this 

 country, is like that which I have made to the system of the Ballous 

 — we have no appreciable discontinuity between the Millstone Grit and 

 the proper Coal-measures, beyond those occasional overlaps which 

 would at times be the necessary consequence of those small and often- 

 repeated movements of depression, which, as it has been already 

 shown, must have attended the deposition of thick sedimentary 

 masses, but leaving no sensible angle between the lower beds and 

 those deposited immediately upon them. Such movements are not, 

 I presume, to be classed with those convulsions in which we may 

 recognize the origin of si/s terns like those of our author. With re- 

 spect to the Dudley N.N.W. anticlinal, it will appear, I think, from 

 what has been above stated (p. Ixxvi), that it must have been produced 

 after the deposition of the lower Permian rocks. If the evidence on 

 which this conclusion rests be rejected, it would be extremely difficult 

 to say what evidence on such points ought to be admitted. With 

 respect to the period of elevation of Cross Fell, all analogy with the 

 whole region on the south of that range, would lead us to conclude 

 that the movement was posterior to the Coal-measui'es (p. Ixxvi). 

 The apphcation of this system to the great mass of Derbyshire is un- 

 questionably inadmissible. 



It appears to me difficult to recognize any distinct traces of the 

 system of Forez in this country. 



We now come to our author's eighth system, that of the North of 

 England, of which the characteristic direction is nearly N. and S,, 

 and the epoch between the Coal-measures and the Rothliegendes, the 

 lowest portion of the Permian formation. This is an important and 

 well-defined system in this country. It will appear from what I 

 have already said (p. Ixxv), that many of the leading phsenomena of 

 the coal-fields of Derbyshire and the North of England are referable 

 to it. At the same time it does not appear to have produced any 

 material effect in the South-west of England and in S. Wales, sup- 

 posing the Dolomitic Conglomerate to have been posterior to the 

 Magnesian Limestone. 



The ninth system is that of the Netherlands and S. Wales. M. 

 de Beaumont places it after the Magnesian Limestone, and before 

 the Dolomitic Conglomerate of Bristol and the Gres des Vosges, which 

 he makes immediately antecedent to the Gres bigarre of the Trias. 

 Its direction in S. Wales is very nearly E. and W. Its extension 

 into the south of Ireland is apparent in the E. and W. anticlinals 

 which affect the Old Red Sandstone and Carboniferous Limestone 

 of that region. 



In Wales and the adjoining counties of England, M. de Beaumont 

 has restricted this system principally to the southern part of the 

 Principality, though recognizing more doubtful indications of its 

 influence in one or two other localities. It appears to me, however, 

 demonstrable, that whatever movements elevated and dislocated the 

 Coal-measures of S. Wales and those of Denbighshire produced also 

 by far the greater part of the phsenomena of elevation throughout 

 the whole of the region now referred to. The proof rests on the 



