196 
WHITE ROCK, HASTINGS. 
nical dejDosition.* This opinion is corroborated, by 
the fact of many of the blocks being covered with 
obtuse, mammillary projections, of various sizes, 
from two to five or six inches in diameter ; and 
which, when the lines of stratification are washed 
away by the action of the waves, appear like 
clusters of depressed spherical bodies. But in the 
quarries in the forest, where a similar structure 
oftentimes prevails, these projections have an ex- 
ternal coating of sand, and bear decided proofs of 
original stratification, in the numerous annular 
sedimentary lines with which they are encircled. 
The thin layers of coarse aggi'egate consist of a 
grey sand, loosely held together by a calcareous 
cement, and are remarkable only for the innu- 
merable remains of fishes, shells, &c., which they 
contain ; this bed is, probably, the equivalent of 
the more friable varieties of the conglomerate of 
the forest. It does not, in any instance, possess 
the compactness of the indurated masses of the 
latter, but contains the same kinds of fossils ; it is 
from this bed that the specimens of Endogeiiites 
erosa, so frequently thrown upon the shore by the 
waves, are derived. 
The ferruginous sand. No. 7* rests on a sandy 
shale, which occurs in thin laminm, and jiresents 
traces of ferns and other vegetables ; it may pro- 
bably be identical with those beds of Tilgate forest, 
that contain the sphenoptcrites and hmchopteriies. 
Beneath this is a coarse, friable, yellowish sand- 
* The wliin-stone of the Shaiiklin saiul, in Western Sussex, occurs 
also in lenticular masses this remark will apply to the compact por- 
tions of almost all arenaceous deposits. 
