490 Mr. Hen slow’s Supplementary Observations to 
near Balia Neah, I observed the cliffs to consist of angular fragments 
of clay-slate embedded in a clay-slate paste, and what is curious, 
these fragments are scarcely to be distinguished from the base 
excepting on the surface of the rock which has been exposed to the 
action of the waves, where they become sufficiently apparent by the 
fragments assuming different tinges of colour, giving the specimen 
a mottled appearance. One or two beds of magnesian limestone 
and iron pyrites occur here. 
GREYWACKE. 
Beds of greywacke occur in the clay-slate which do not lie 
conformably with the direction of the laminse of the latter. The 
description of one will serve to convey a general idea of the others. 
On the north part of Douglass-bay at the top of the hill over 
which the road passes upon quitting the shore, is a quarry in which 
one of these occur. Two sections at right angles to each other 
afford a convenient opportunity of examining its position. 
Fig. 1. Plate 35, is a section perpendicular to the direction of 
the strata, and fig. 2, parallel to them. The direction of the bed is 
nearly north and south (that of the strata being north-east and south- 
west,) and its dip is to the west. In one part it is seen traversing 
the clay-slate with great regularity, but in the other it becomes 
Confused, and the schist passes insensibly into it. 
On Peel hill there occur beds of a similar description; also 
between Port-le-Murray and the small patch of limestone to its 
south, and in the floor of a quarry at Port Eshee, may be seen a 
bed of a similar quality, and two others which apparently spring 
from it, intersect the slate in the manner represented by fig. 3. 
One of these is bounded by soft clay on one side and indurated on 
the other, whilst the other has the hard clay on one side, but on 
