File:The Quarterly journal of the Geological Society of London (12894937733).jpg

104 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Dec. 2,
The accompanying section exhibits the general geological features
of the Belfast Hills.
Fig. 1. — Section from the River Lagan to Black Mountain.
Black
Mountain.
Fall'
Road
River River
Blackstafr. Stranmillis. Lagan.
5 =
1. Basalt.
2. Hard Chalk.
3. Greensand.
4. Lias.
5. Keupen
6. Tertiary Sands.
3. Zone ofAvicula contorta. — Sections of this formation have been
examined in the escarpment of the Belfast Hills, extending from
near Lisburn to Whitehead, a distance of 24 miles.
From Moira, 15 miles from Belfast, to Kilcorig, 9 miles south-west
of Belfast, the Avicula-contorta beds are absent, the Hard Chalk
lying directly upon the Keuper Marl.
In Colin Glen, 5 miles south-west of Belfast, the greatest deve-
lopment of the Liassic series occurs.
This locality is referred to by General Portlock in his Report,
p. 107. Treating of the section at Lisnagrib, the beds of which are now
identified with the Avicula-contorta zone, he says, " It may be re-
marked that the shaly bed containing Carclium strialulum .C.Hhosti-
cum. is again found 40 miles distant in Colin Glen, near Belfast; but as
yet the calcareous grit*, with the teeth and scales, has not been
there discovered." It is very gratifying to me to be able to report
the presence of these forms. Prom the following sections it will be
observed that a fish-bed is a marked feature of this zone throughout
the neighbourhood. In addition to the species observed by Portlock,
I have found two others.
It is interesting to note the great variety of lithological characters
that occurs in the Colin Glen Section of the Rhsetic series.

" The section at Lisnagrib principally consists of alternating beds of dark
shale and calcareous