58 BINNIE: MESOZOIC rocks of the KOETII-EAST coast of IRELAND. 
have a thickness of fifty feet, from which he computes tlieir 
actual thickness at 120 feet ; they dip at an angle of 27°. 
(b) Transition beds being white marls and black shales. 
(c) Black indurated shales with A. planorbis. 
(d) Sub-chrystalline fossiliferous limestone with A. angulatus. 
(e) Compact blue argillaceous limestone with Gryphaea incurva, 
which he considers to represent the A. Bucklandi zone of England. 
It is exposed near the coastguard station. 
(f) In the Belfast Museum are a few fossils which have been collected 
here, and which indicate the presence of the Belemnites acutus 
zone, but this zone is generally concealed. 
The above section Mr, Tate considers should not only be regarded 
as typical for Ireland but also for Great Britain. 
The angulatus zone which Tate considers to be identical with 
that of A. mercurius of the Cote D'Or, is the one which is most 
largely developed. 
The planorbis zone occurs at Colin Glen, Whitehead, Glenarm, 
"Waterloo, etc. 
The angulatus zone occurs at Larue Lough, "Waterloo, Glenarm, 
Tircriven Burn, etc. 
The Bucklandi zone at Waterloo, Tircriven Burn, and Glynn. 
The Belemnites acutus zone occurs at Ballintoy, Waterloo, and 
Carrickfergus. This zone is either parallel to, or newer than that of 
A. Turneri. 
The Middle Lias Marls occur at Ballintoy. It will be seeii 
from the above that only the Lower Lias is developed. 
The cretaceous series consists of upper greensand and chalk 
limestone, which may be conveniently sub-divided as follows : — 
(a) White limestone. 
(b) Chloritic sandstones and sand, called " Mullato stone." 
(c) Yellow sandstones and marls. 
(d) Glauconitic marls. 
The uppermost portions of (b) are often conglomeratic, pebbles 
of 'quartz being imbedded. 
The Greensand contains many quartz pebbles, and some few 
phosphatic nodules, but never in sufficient number to make their 
