Heports and Proceedings — Geological Society of London. 235 



gradually a very steep angle. The remainder of the edges of the 

 plate of plaster, having now room, were able to approach each 

 other. Pliable material above the plaster was thrown into one or 

 a few extensive folds, while that beneath assumed a greater number 

 of small folds. 



2, " The Ehastic Rocks of Monmouthshire." By Linsdall 

 Eichardson, F.G.S. 



The Ehgetic rocks occur only in the neighbourhood of Newport ; 

 and the present paper describes three new sections and four new 

 exposures. They are the following : Goldcliff, Bishton, Llan- 

 martin, Llanwern, Milton, Bishpool, and Lis-Werry. Measured 

 sections are given at each locality, that at Goldcliff being especially 

 full in the middle portion of the series, because when visited by 

 the author it was exposed in consequence of a breach in the 

 sea-wall. The plane of separation between the ' Tea-green Marls ' 

 (Keuper) and the Black Shales of the Ehgetic is very definite, and is 

 not infrequently accompanied by an inch or two of conglomerate. 

 The Ehsetic ocean appears to have spread with comparative rapidity 

 over the flats of the ' Tea-green Marl ' in this neighbourhood. The 

 most complete sequence from Keuper to Eheetic is around Cardiff, 

 where the ' Sully Beds ' (Etheridge's ' Grey Marls ' : not the ' Tea- 

 green Marls,' which belong to the Keuper) constitute transition-beds 

 formed where deposition proceeded continuously. Farther north 

 the ' Black Shales ' overstep on to lower and lower portions of the 

 •Tea-green Marls.' A non-sequence appears to occur at the base of 

 the Paper Shales at Goldcliff, where the upper surface of the Gotham 

 Marble equivalent is conspicuously water-worn. 



III.— April 5th, 1905.— J. E. Marr, Sc.D., F.E.S., President, in the 

 Chair. The following communications were read : — 



1. "On the Divisions and Correlation of the Upper Portion of 

 the Coal-measures, with special reference to their Development 

 in the Midland Counties of England." By Eobert Kidston, 

 F.E.S. L. & E., F.G.S. 



The following classification of the Coal-measures is proposed by 

 the author : — 



Froposed Names. Names previously used. 



4. Eadstockiau Series = Upper Coal-measures. 

 3. Staffordian Series = Transition Series. 

 2. "Westphalian Series = Middle Coal-measures. 

 1. Lanarkian Series = Lower Coal-measures (including the Millstone Grit). 



The Staffordian Series includes the Blackband Group, beginning 

 with the Bassey Mine Ironstone, the Etruria Marl Group, nearly 

 barren of plant-remains, and the Newcastle-under-Lyme Group. 

 The Eadstockian Series includes the Keele Group and various beds 

 in the Midland Coalfields hitherto referred to the Permian System. 

 A classified table is given of all the plants known from the two 

 upper series in the Potteries Coalfield, and a list of those observed 

 in the Newstead boring, Trentham. The plant-yielding beds in 



