Vol. 60.] IGNEOUS ROCKS OF THE BRISTOL DISTRICT. 145 



(2) At Spring Cove, Weston-super-Mare. 



In the limestone above the altered, and in parts variolitic, olivine- 

 basalt, Sir Archibald Geikie & Mr. Strahan found tine volcanic dust 

 for about 3 feet above the surface of the lava. We have, however, 

 a rock-slice taken from a height of 8 feet above the basalt which is 

 full of small lapilli. On the other hand, although there are several 

 ashy-looking lenticular bands below the lava, our four rock-slices 

 taken from these beds at several different levels show no conclusive 

 evidence of the occurrence of distinct lapilli. We are therefore 

 unable fully to endorse the statement that ' through some 30 or 

 40 feet of its mass ' the limestone ' below the basalt is full of 

 disseminated volcanic particles.' l A soft, red, ashy-looking bed, 

 close to the path leading down into the cove, contains abundant 

 large corals belonging to the genus Campoplujllum. 



(3) Above Kewstoke, Milton Hill. 



In the ' Summary of Progress ' for 1898 (p. 106) it is stated that 



' fragments of the amygdaloid were found by Mr. Spencer Perceval at the 

 Tollsate, which show that this rock extends inland for a mile and a half. 

 But immediately to the east, over the bare limestone-surface above Kewstoke 

 or Milton Hill and the ground towards Worle, Mr. Strahan could find no 

 trace of it.' 



Mr. Spencer George Perceval writes to one of us : 



* Which Tollgate is meant I do not know. In the fields immediately outside 

 the wood on Worle Hill at the eastern end, north of the Lodge. I found in 

 1890 that an overflow of trap occurred, not visible at the surface, but at 

 a slight depth underneath. I got specimens with the limestone and trap in 

 contact. I certainly should not term the trap an amygdaloid.' 



In a further communication, Mr. Perceval has courteously supplied 

 extracts from his notes made at the time. It is quite clear from 

 these notes that he then discovered an extensive run of the ' trap ' 

 on Milton Hill. In gardens west of the road running from Milton 

 to Kewstoke he instituted a series of diggings, which showed that 

 the ' trap-bed ' was there in situ. It was also found, by digging, in 

 the garden of the lodge just outside the wood, on the western end 

 of Worle Hill. ' Trap ' was also found in places within the wood 

 along the same strike. These observations leave no doubt of the 

 extension of the lava in this direction. One of us became acquainted 

 (without any knowledge of Mr. Perceval's previous discovery) 

 with the * trap '-fragments, some of them very vesicular, which are 

 scattered over the gardens in the north-western angle of the cross- 

 tracks, one leading along the crest of the hill, the other crossing 



1 ' Summary of Progress of the Geological Survey for 1898 ' p. 10f>. 

 Q. J. G. S. No. 238. l 



