Abstracts of Papers read on Geology. 523 



one continuous coal-field, with, its deepest part at Lichfield, Sutton 

 Coldfield, and Coleshill, but the basin rising to the south as a whole, 

 the thick coal of Sandwell and Hamstead will split up into two or 

 three seams, and under these conditions will be worked Longwall, 

 with better commercial results. The area between the Staffordshire 

 Coal-field and Shropshire has been most vigorously investigated, and 

 the proofs at Colwich, Huntingdon, Essington, Four Ashes, and 

 Baggerridge show that this area is going to be rich in coals of 

 good quality and laid down under conditions that will allow of 

 remunerative working. 



On the Shropshire side very little has been done to extend that 

 coal-field to the west of either the Coalbrookdale or the Forest of 

 Wyre Coal-fields ; the edges of the Old Red Sandstone preclude any 

 hope of extension, but in the Highley and Kinlet and Billingsley 

 area it is most probable that future deeper sinkings will prove deeper 

 coals than the two seams at present working, whilst the area to the 

 east is full of promise. As soon as the Severn Valley Fault, which 

 is some 300 to 400 yards downthrow east, is crossed, a new coal-field 

 will be found, and I think the area between here and the old coal-field 

 will be divided into two basins, with a Silurian anticline between 

 them as proved by the Claverley boring. 



8. On the occuerence of a Wind-woen Eock-sukface at 



LiLLESHALL HiLL, SaLOP, AND OF "WlND-WORN StONES THERE 

 AND ELSEWHERE. By FrANK Eaw, B.Sc, F.G.S. 



LILLESHALL HILL, lying some 5 J miles north-east of "Wellington, 

 and extending north-east and south-west, is a ' hogsback ' of 

 TJriconian, and is largely bare rock. The exposed rock of its south- 

 east side consists towards the north-east of very hard halleflintas, 

 interstratified with somewhat softer tuff, and to the south-west of 

 this and opposite the Monument of still harder felsite conglomerate 

 and grit. 



Practically the whole of this rock- surface has been ground smooth 

 and, where hardest, has been highly polished, the smooth surface 

 being traceable everywhere except where it has obviously been 

 removed by weathering or quarrying. The surfaces of projecting 

 masses of the conglomerate are perfectly fresh, being ground smooth, 

 deeply fluted, and polished as by wind-blown sand, the radiating 

 flutings showing the paths of escape of the prevalent wind. To the 

 north-east the rock-surfaces have been much more even, perhaps 

 based on a previously glaciated sui'face, and the flutings are parallel 

 and in that direction less and less highly inclined, till at the north- 

 east end they lie at an inclination of 15° to 20° up to the north in 

 north and south planes. 



From the south-west end of the wind-worn surfaces already 

 described similar polishing can be traced across the hill to the 

 north-west on the steep rock-surfaces of quartz-veined halleflintas 

 which bound on the south-west the highest part of the hill. 



South-west of this the crest of the hill is fairly flat and covered 

 with grass. Here two reservoirs have been constructed for the 



