208 CARBONIFEROUS VOLCANIC ROCKS OF SOMERSET 
i)ut from the fact that the included masses of limestone 
dwindle rapidly in size and number from north to south, 
and that the lenticular sheets of lava and tuff representing 
individual minor flows also slope from north to south, it 
would seem that the vent lay somewhere to the north 
of this Spring Cove exposure. 
“ Except for the presence of lapilli of basalt in the base 
of the limestone resting at once on the basalt, it might be 
difflcult to show that the whole is not an intrusive sheet. 
The conditions in these submarine flows appear to be 
very like those in a sill or intrusive sheet, where, as Prof. 
Lapworth has suggested, we may get tuffs and included 
masses of sedimentary material confusedly mixed, and 
drawn out into lenticles as here described.” 
(3) Above Kewstoke, Milton Hill. 
In the Summary of Progress it is stated that “ fragments 
of the amygdaloid were found by Mr. Spencer Perceval at 
the Tollgate, which shows 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 And no trace 
of it.” Mr. Spencer George Perceval writes to one of us : 
“ What Tollgate is meant I do not know. In the fields 
immediately outside the wood on Worle Hill at the east end, 
north of the Lodge, I found in 1890 that an overflow of 
trap occurred not visible on 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, 
