472 Geological Society : — ■ 



vein of ore was S inches thick. More than 100 tons of ore have heen 

 sent to London. 



17. "On Chesil Beach, Dorsetshire, and Cahore Shingle Beach, 

 Co. Wexford." By G. H. Kinahan, Esq., M.R.I.A., &c. 



The author carefully compares the situations, structures, &c. of 

 these two shinglo beaches, and points out that their wonderful 

 similarity is due to nearly the same natural causes in each case, but 

 that at Chesil the driftage is due to the flow-tide current aug- 

 mented by waves caused by the prevailing winds, while at Cahore 

 the driftage is solely due to the flow- tide currents, its effects being 

 modified by adverse wind-waves. The sorting of the pebbles on 

 Chesil Beach is probably chiefly caused by the progressive increase 

 in the velocity of the tidal current as it approaches the nodal or hinge- 

 line of the tide in the English Channel. The author considers that 

 the current due to the flow of the tide has greater drifting-power 

 than wind-waves. 



18. " Some recent Sections near Nottingham." By the Bev. A. 

 Irving, B.A., B.Sc, E.G.S. 



The author describes a section of the strata exposed during the 

 recent construction of a railway line from Carlton, three miles to the 

 east of Nottingham, through Daybrook, to Kimberley. 



The section commences in the Upper Keuper ; the Lower Keuper 

 (Waterstones) are penetrated at a short distance from the village of 

 Gedling. These beds are well shown as the cutting enters the 

 plateau known as the " Mapperley Plains," and consist of a series of 

 alternating red marls and sandstones. One of the sandstone-beds 

 is nearly white ; and hollows varying in size from that of a pea to 

 that of a fowl's egg are of frequent occurrence. These are pro- 

 bably due to the dissolving out of small calcareous concretions. 

 This bed occurs high up in the "Waterstone series. The total thick- 

 ness of the Lower Keuper may be estimated at about 100 feet. At 

 about one quarter of the height from the bottom ripple-marks are 

 abundant ; sun-cracks, rain-pittings, and pseudomorphs also occur ; 

 but as yet no footprints have been found. 



The line then crosses about 3 miles of Bunter country. In the 

 upper portion of the series the pebble-beds appear to be wanting, 

 and their place is taken by a series of thinly laminated, micaceous, 

 whitish, false-bedded sandstones. These are succeeded by marine 

 conglomeratic beds, which extend for some distance. A mile further 

 west the sandstones become softer, and assume a more mottled ap- 

 pearance, which they retain all the way to the Leen valley, where 

 the base of the Bunter is hidden by alluvium. 



The cutting then passes through an outlier of Lower Bunter and 

 Upper " Permian " Sandstone. Two faults occur at this spot, by 

 the first of which the Permian is thrown down several yards, whilst 

 by the second it is let down below the level of the railway. 



Near the village of Watnall a tunnel pierces the Magnesian Lime- 

 stone and the Coal-measures. This junction is distinctly uncon- 



