^ol. 68.] ARDEN SANDSTONE GROUP OF WARWICKSHIRE. 263 



ago, as mentioned in several of his papers (for instance, 96). The- 

 outcrop may be more extensive than that shown on the map, but 

 I have not visited the grounds of Edstoue Hall. The sandstone 

 here crosses the Edstone stream and the railway, and its course 

 can be followed along a winding escarpment about Songar Grange 

 towards Snitterfield. East of Songar Grange, and also at an outlier 

 to the north of it, 4 feet of white, flaggy, rippled sandstone, with 

 Estheria^ occurs. A mile farther to the south-east the zone seems 

 to be still thinner, or may be split up by red marls, but I have not 

 attempted to follow the band farther in this direction. 



On the eastern side of the Hatton & Bearley Railway the zone 

 is best developed and exposed at Wolverton, and I have found suffi- 

 cient indications of the sandstone to enable me to link it up with 

 that mapped by the officers of the Geological Survey at Cophill 

 and Claverdon Lodge. The sandstone zone was also found to occur 

 capping the Lower Marls along a line from Wolverton to Ganna- 

 way Gate (where it is fairly well exposed and dips westwards). 

 It continues still farther northwards ; but the exposures are poor, 

 and the zone seems to be thin. 



(/) Hockley Heath and Nuthurst. 



The district about Hockley Heath is covered mainly by a thin 

 zone of Upper Keuper Marls, from below which the Arden Sand- 

 stone comes to the surface as inliers at several places. The largest of 

 the inliers occurs in the valley between Illshaw Heath and Box Trees, 

 and two others are shown on the map (PI. XYIII) near Bentley 

 Manor. The sandstone zone was also proved in a well that was 

 sunk to a depth of some 40 feet, about 200 yards north-east of 

 the ' JSTag's Head ' at Hockley Heath, as a considerable quantity of 

 grey shale and grey marl was thrown out. South of that village 

 the top of the zone must lie quite close to the surface, which is, 

 however, formed of a gravelly drift that obscures the Keuper rocks. 



Between Hockley Heath, Nuthurst, and Lap worth Hill the 

 mapping of the zone presents more difficulties, and yields less 

 satisfactory results than in any other part of the area described. 

 On the south side of the valley drained by a small stream (the 

 Nuthurst Brook), which flows at the foot of Lapworth Hill, sand- 

 stone and grey marl are seen on the higher slopes to pass up into 

 red marl at two places, one west and the other south-east of Nut- 

 hurst House ; but red marl is to be seen below these outcrops, 

 intercalated, apparently, between the sandstone mentioned above 

 and a green marl that occurs lower down the valley-slope. The 

 zone thus appears to be losing its individuality here, and I have 

 been unable to follow its course to the north-west. Eastwards it 

 can be traced across the Stratford road, keeping to the top of the 

 slope, beyond which, however, it descends to the stream-level. 

 The beds here have, therefore, a northerly or north-easterly dip. 

 and this fact has been kept in view in inserting the conjectural 

 boundaries shown on the map (PI. XYIII). 



