254 
GEOGNOSY OF PART OF 
At the spot marked (4.) in the map*, the rock first rises 
much above the level of the sand, being there about eight 
or ten feet in height. Here some small masses of compact 
felspar are imbedded in the trap. After some distance, a 
limestone again occurs, but under the trap, and on it a 
sandstone (5) ; against the south side of which the trap 
rests, and in some parts lies upon the grit, gradually ter- 
minating in a thin edge. The two rocks may in several 
places be found adhering firmly to each other. A small 
mass of crystalline limestone projects from under the trap 
near this place, and on the surface of the latter is a bed of 
grit, pieces of which may also be observed imbedded in that 
rock, and also a fragment of an impure limestone (8). The 
trap here gradually rises inland, forms a high hill, which is 
part of a range extending to Spindlestone, about two miles 
from the coast, where it forms lofty, picturesque chffs, in their 
structure approaching the columnar: the name appears to 
be derived from some insulated irregular columns which 
project from the mass. 
A bed of limestone next occurs, about two feet thick, 
lying on the trap. Where in contact with that rock its 
appearance is very crystalline, and as it recedes from it, it 
gradually loses that feature. A vein of trap is here seen, 
generally three feet wide, cutting through the limestone ; 
and from it run many veins, from two inches, to half an 
inch, and still less, in width, and many yards in length, to 
which the limestone may be observed adhering. 
Near the spot marked 16, a vein of heavy-spar occurs 
in the limestotte; At 17, a mass of fine-grained sandstone 
projects from below the trap. 
After passing some distance over the trap, a curious ap- 
pearance is seen in a basin-shaped depression : a bed of 
Plate XL 
