202 CARBONIFEROUS VOLCANIC ROCKS OP SOMERSET 
“ On the ragged upper surface of this basalt the lime- 
stones have been laid down in the same way as underneath. 
The volcanic episode, although it locally interrupted the 
continuity of the accumulation of organic detritus on the 
sea bottom, seems to have effected no change in the general 
conditions of sedimentation. Fine volcanic dust appears 
in the overlying limestone for about three feet above the 
surface of the lava, and thereafter the calcareous rock 
assumes its usual highly fossiliferous character. 
“ That the little vent from which the discharges took 
place lay to the westward, under what is now the Bristol 
Channel, may be inferred from the disappearance of the 
volcanic zone as the ground is traversed in the opposite 
direction.” 
Our reading of the section is as follows, at the top : — 
ft. 
6. Limestone often ironstained, with many small ashy 
fragments in the lower four feet . . , .40 seen 
5. Amygdaloidal and variolitic basalt . . . 35-40 
4. Compact grey or reddish limestone with cherty patches 9 
3. Ironstained limestone . . . . . .18 
2. Compact ironstained limestone with many Zaphrentid 
corals ..... ... 6 
1. Argillaceous limestone ...... 
Beds (1) and (2) are seen in the path leading down to 
Spring Cove, and the dip here is 38° S. A dip of 25° S. 
10° W. was obtained from the beds above the basalt. Sir 
A. Geikie and Mr. Strahan say that the limestone, through 
some 30 or 40 feet of its mass below the basalt, is full of 
disseminated volcanic particles. Though we have sliced 
specimens, three of them taken respectively from levels 
of 12, 17, and 27 feet below the basalt, we have obtaned 
no clear evidence of the presence of ashy fragments in the 
limestone below the basalt, but ashy particles are plentiful 
above it to a height of at least 8 feet. 
Mr. W. S. Boulton’s paper, the greater part of which we 
are enabled, through his kindness and that of the Council of 
