198 CARBONIFEROUS VOLCANIC ROCKS OF SOMERSET 
crowded with crinoidal joints, corals, bryozoa, brachio- 
pods, etc. 
“ Above this tuff lies a bed of hard, fine-grained, finely- 
laminated purple and grey sandstone, about 2^ feet 
in thickness, the most marked feature in which is the 
presence of numerous small cylindrical pencil-like bodies 
which descend from the upper surface of the band vertically 
across the lamination of the sediment. This may be worm- 
burrows. This arenaceous band seems to mark a pause 
of some duration during which volcanic activity was 
quiescent, and the calcareous organisms had not yet re- 
covered their former place over this part of the sea-floor. 
Possibly this band may be paralleled with the lenticular 
limestones (No. 10) in the previous section. 
“ Eruptions were renewed for the last time, when a 
quantity of ashes was discharged, now represented by a 
band of green and red tuffs from 5 to 7 feet thick. 
These materials may be continuous with the band No. 11 
further west, like which their layers of coarser and finer 
material are mingled with much calcareous material. They 
are well banded, and in their upper part enclose rows of 
blocks of finely slaggy amygdaloid. Immediately above 
them comes a limestone 12 feet thick, which passes upward 
into some red, impure, decaying and probably ashy lime- 
stone, and this is followed by the great overlying mass of 
crinoidal limestone.” 
We have little or nothing to add to the above general 
account, but our reading of the section is as follows : — 
ft. in. 
20. Thick crinoidal limestone to top of cliff . . . ' 
19. Weathered gap with red shale visible at eastern corner 10 0 
18. Limestone . . . . . . . . 12 0 
17- Green and red ash. . . . . . 5 to 7 0 
16. Sandstone with vertical cylindrical bodies . .26 
15. Fine ash . . . . . . . .20 
14. Lenticular limestone band . . . . . 3 to 6 
13. Fairly coarse ash with several highly calcareous bands 
