Dr. Wheelton Hind — The Yoredale Series. 159 



Suifolk, Cambridge, Nottingham, Stafford, Warwick, etc., he says 

 of the ice-sheet or great glacier, which is supposed to have covered 

 them : " It would be a curious kind of glacier which could at once 

 carry boulders from the south as well as from the north, from the 

 west as well as from the east, mixing them all in one deposit ; 

 and which was able neither to make moraines, nor to striate rock 

 surfaces, nor to smooth projecting crags" (id., p. 55). I quote this, 

 not because I am in general agreement with Professor Carvill Lewis, ^ 

 for I am not, but because he being considered an almost inspired 

 prophet among the Neo-Glacialists, it is useful to use one of his 

 bomb-shells against them. 



Thus I have, so far as T can see, shown that it is impossible to 

 attribute the drift deposits of the Eastern Counties of England 

 or their contents to either ice-sheets or glaciers. 



Note. — Eeferring to note on p. 128, March, 1897, I am reminded 

 that hollows in the floor of the glacier could clearly only be made 

 if the glacier remained stationary. — Edit. 



V. — On the Subdivisions of the Carboniferous Series in Great 

 Britain, and the True Position of the Beds Mapped as 

 the Yoredale Series.^ 



By "Wheelton Hind, M.D., B.Sc.Lond., F.R.C.S., F.G.S. 



THE coi'relation of the various series of Carboniferous rocks 

 which occur in different districts of Great Britain according 

 to the fourfold subdivision proposed by the late Professor Phillips, 

 has always presented great difficulties, on account of the marked 

 changes in sequence, thickness, and lithological character which 

 occur in districts only a few miles apart. The consideration of 

 this difficulty was the subject of a special Sub-Committee of the 

 International Geological Congress of 1888. The Eeport, however, 

 indicated only a difference of opinion, and consisted chiefl}'^ in a series 

 of typical sections showing the local development of Carboniferous 

 rocks, and the schemes of classification proposed by various members 

 of the Sub-Committee. 



Of late, the officers of the Geological Survey have, to a large 

 exlent, dispensed with the term Yoredale Series, and have substituted 

 the title Carboniferous Limestone Series, to denote the whole of the 

 beds from the base of the Carboniferous to the bottom of the Mill- 

 stone Grit Series in England. But this term was used by Professor 

 Phillips to include, not only these beds, but the Millstone Grit as 

 well (" Geol. Yorks.," pt. ii, p. 11). 



Unfortunately, the term Carboniferous Limestone Series has been 

 applied, not only to the alternating series of sandstones, limestones, 

 and shales which are characteristic of the northern representatives 

 of the Carboniferous Series, but has (following Professor Phillips) 

 been used to denote the massif of the Carboniferous Limestone, 



^ By some lapse of memory I find I called Professor Carvill Lewis " Carvell 

 "Williams " in two places in my previous paper, Geol. Mag., December, 1896, 

 p. 537.— H. H. H. 



2 Eead before the Geological Society of London, December 16, 1896. 



