264 
Proceedings of the Royal Society of Edinburgh. [Sess. 
The next series of identifiable fragments, thirteen in number, are of 
Cretaceous age. Nine of these are of chalk and four are chalk flints. One 
of the chalk fragments (4 inches in diameter) consists of ochreous chalk, 
containing numerous fossils, including the remains of a small species of 
Exogyra, a Dentalium, and several polyzoa and foraminifera. It has been 
glaciated before deposition and afterwards cariously weathered by solution. 
One specimen of hard chalk, 2J inches in diameter, contains lines of well- 
rounded sand grains, like the base of the chalk where it overlies the 
Triassic sandstones below the Antrim Volcanic Plateau. It is well glaciated 
and faceted. Four smaller well-glaciated fragments of hard grey chalk 
also occur. Two specimens of finely crystalline white marble, like the 
chalk of Antrim where it has been invaded by intrusive igneous rocks, 
are also met with. One of these (5 inches in diameter) is well glaciated 
and faceted on one side, and shows a ragged fractured surface on the other. 
This specimen has evidently formed part of a larger boulder which has 
been glaciated and subsequently broken prior to transportation, for 
it bears evidence of having been embedded nearly edge on, and must 
have lain for some time with about two-thirds of its surface exposed 
(Plate IV.). 
Of the four specimens of flint, varying from two to three inches in 
diameter, the largest is a portion of a dark flint nodule with part of its 
original coating or " skin ” still remaining. Glacial markings are found 
both on the skin and on the fracture faces. It has been still further flaked 
since being glaciated, but at so remote a date that a well-marked “ patina ” 
has been developed over the newer faces. The remaining three flints are 
whitish, like those of Antrim, are well-rolled portions of fractured nodules, 
and show “ bulbs of percussion ” or “ chatter-marks ” where they have been 
hurtled together in a torrent, or where they have been subjected to wave 
action (Plate V. fig. 2). 
Five small specimens cannot with any certainty be classed with 
the above. One of these, of coarse-grained dolomite, like a vein-rock, is 
ice-moulded. Such veins occur in the Carboniferous Limestones of Ireland ; 
in fact, a thin vein of like character occurs in one of the limestone blocks 
from the present locality. Two are ice-moulded fragments of vein quartz 
which have come from a region of schistose rocks in a low grade of meta- 
morphism. Two well-rounded or rolled pebbles occur ; one is of vein quartz 
and shows “bulbs of percussion ” (Plate II. fig. 5), and the other is of white 
crystalline limestone or dolomite (Plate II. fig. 6). 
(b) Metamorphic Rocks . — Under this category are grouped two distinct 
types of rocks, viz. (1) a set of highly crystalline, coarsely banded gneisses, 
