236 Reports and Proceedings — Geological Society of London. 



the shaft of the Hamstead Colliery, near Birmingham, between the 

 depths of 243 and 411 yards from the surface, are undoubtedly 

 referable to the Radstockian Series and to the Keele Group of the 

 Potteries Coalfield ; and the beds without plants, from 209 yards 

 downward, belong to the same group. A bed at 440 yards is 

 referable to the Newcastle Group. A list of these plants is given. 

 These two series are recognizable in Denbighshire ; and the 

 Euabon Marls of the Staffordian Series are as barren in plant- 

 remains as the corresponding Etruria Marls. A list is also given 

 from red and purple shales in Cuuiberland, which contain Upper 

 Coal-measure plants. Part of the Ardwick Series of Manchester 

 belongs to the Staffordian Series. A table of all plants known from 

 the two upper series (3 and 4) is next given, the distribution of 

 species in the four subdivisions is analysed, and the differences 

 between the two series are discussed. Finally, a list of plants from 

 the Bradford Colliery, Manchester, from shales extending from 8 to 

 107 yards above the "Bradford Four-Foot Coal," is appended, and 

 the beds are placed in the Staffordian Series ; while the species 

 from shale immediately below this coal and from shale 88 yards 

 lower down are classed with the Westphalian Series. 



2. " On the Age and Eelations of the Phosphatic Chalk of 

 Taplovv." By Harold J. Osborne White, F.G.S., and Llewellyn 

 Treacher, F.G.S. 



The paper opens with an account of the work hitherto accom- 

 plished in the Phosphatic Chalk of Taplow, and especially of the 

 work of Mr. Strahan. The rocks at this locality are then described 

 in detail, and the following classification is adopted : — 



Feet. 



E. Upper White Chalk (visible) le" 



D. Upper Brown Chalk, or rich phosphatic band ... about S 



C. Middle White Chalk „ 16 



B. Lower Brown Chalk, or rich phosphatic baud ... ,, 4 



A. Lower White Chalk (visible) 17 



The Lower White Chalk includes a thin layer of tabular flint 

 and one of elongated nodular flints, and the first signs of phosphatic 

 material were observed a few inches below the tabular seam. 

 Attention is drawn to the presence of phosphatic nodules and 

 concretions at certain horizons. Fossil lists are given from each of 

 the above divisions ; and the authors conclude that the Lower White 

 Chalk belongs to the zone of Micraster cor-anguinum, and the suc- 

 ceeding beds to that of Marsiipites testudinarivs ; while the lower 

 phosphate-band represents the lower part of the Uiiitacrinus-hai.n(\, 

 and the upper one that of the Marsupites-htmd of that zone. In each 

 phosphate-band the base is quite sharp, being defined by a rock-bed 

 in the Chalk; but the upper limit is very ill-marked. The Middle 

 White Chalk is in part divided into lenticles with slickeusided sur- 

 faces. The authors find Actinocaniax verus in B, and A. granulaUis 

 in D and E, but not A. qiiadrotus in any bed. Phosphatization is 

 not confined to the Foraminifera and other microscopic remains, 

 but occurs in all shells and structures which are readily penetrable. 



