260 DESCRIPTIVE CATALOGUE 
colour than the remainder of the rock. Most of the pebbles are amygdaloidal, with 
the cells very much compressed, and filled with minerals. The cells in each pebble 
have their long diameters parallel, but as they stand embedded, there is no uni- 
formity between the direction of the cells of the different pebbles. The paste, 
which is of an earthy character, is also very full of amygdules, compressed, and 
having a uniformity of direction through the whole mass. In general appearance, 
this specimen resembles the ordinary red shale conglomerates, and may be com- 
pared with No. 201, and also Nos. 212, 259, 245, and 377. The elongated cells 
in some of the enclosed pebbles are very much bent and contorted. Shows two 
periods of action. 
629. Bears E. and W. Very ferruginous; colour, reddish gray, with a slight 
greenish tint in some places. In the mass, fine granular; in parts, crystalline; the 
more crystalline portions seeming to be near joints, and to be of but little depth. 
The joints on weathered surfaces are very red. It is the rock described in 1848 as 
“ Columnar Rock.” It is disposed to become globular in the mass, the diameter of 
the globes being, occasionally, over twenty feet. In general structure, resembles 
some of the N. 30° E. dikes; and also bears some analogy to the volcanic grits, such 
as are found in the neighbourhood of Kawimbash, Inaonani, and Two Island Rivers. 
It is at some places an overlying rock, and is connected with the ferruginous grit- 
beds. At some localities it appears to bear nearly N. and S.; then N. 30° E., and 
again EK. and W. The difference in bearing I consider to be due to the different 
directions in which the overlying beds are cut through and exposed. Very feebly 
magnetic. The crystalline portion is made up of deep-red felspar, white felspar, 
black hornblende, and peroxide of iron in lumps. A few quartz crystals are pro- 
bably present, but it is not certain that the light-coloured mineral is not felspar. 
(See No. 633.) The joints are lined with zeolites, either apopholite or stilbite, and 
Heulandite (?). It has a tolerably straight fracture, though the surface is rather 
uneven, and shows a tendency to be nodular. At Two Island River, and below, 
this rock bears N. 30° E. 
630. Bears N. 30° E. Colour, greenish gray, with a reddish tint. Disintegrates 
easily. Has an irregular, lumpy fracture. Heavy. So filled with green mineral, 
that it is difficult to determine its composition. Structure, granular. The green 
mineral which is so extensively disseminated through it is, probably, a variety of 
tale. B. B. in the forceps loses its green colour, and becomes whitish, and with dif- 
ficulty becomes rounded on the edges, with slight intumescence. With borax, fuses 
to a clear glass, which, when cold, has a green tint, but is honey-yellow in the outer 
flame ;—with salt of phosphorus, fuses to a white glass, with a silica skeleton. This 
mineral has, probably, been mistaken for epidote, as well as for chlorite. It re- 
sembles some varieties of the first in its fine granular and scaly disseminated state, 
and the latter in large lumps. It is the mineral so extensively developed in the 
voleanic grits, and which also occurs in thin veins in those rocks, associated with 
calcareous spar and zeolites, as well as in the metamorphosed shales at some localities. 
This rock is columnar, and overlying at many points on the Lake shore; and the 
dike to which it belongs has, probably, been one of the sources from which the volcanic 
grits of Two Island River and the neighbourhood were derived. It does not affect 
