62 binnie: mesozoic rocks of the north-east coast of irelan^d. 
the formation, certainly the Norwich, and probably even the Maes- 
tricht or yellow chalk, of the continent. 
He divides the whole chalk into two divisions : — 
(a) Chloritic Chalk, the basement beds being represented in the 
East by the bed of Ananchytes ovatus only. 
(b) Upper Chalk also described as white limestone. 
Mr. Tate calls his (a) Glanconitic Sands the zone of Exogyra conica 
or E. columba, in which thirty-six species occur, nineteen of which 
pass up into higher beds ; this he calls the equivalent of the 
Blackdown beds. 
(b) The yellow sands or zone of Ostrea carinata, in which there are 
nineteen species, eight of which pass up, nine being present for 
the first time, he calls the equivalent of the Upper Green sand and 
Cenomanien of Normandy, 
(c) The Chloritic Sands or zone of Inoceramus crispi contains seventy- 
eight species, ten of which occur in lower zones, nine only 
extending to the limestone. This, he says, is the equivalent of 
the Upper Greensand. 
(d) The Upper Chalk he divides into three zones. 
(1) Zone of Ananchytes gibbus. 
(2) Spongarian zone. 
(3) Ammonites Gallevilliensis zone. 
He says that it represents the upper chalk of Norwich, Craie de 
Meudeu, and some part of the Maestricht chalk. 
M. BaiTois sums up in his paper as follows : — 
(a) The Glanconitic zone of Ostrea conica belongs to that of Pecten 
asper of the Warminster beds. It is very like the Holaster 
nodulosus of the N. E. of France. 
(6) The yellow sands belong to that of Holaster subglobosus. 
(c) The zone above this is Turonien. 
He gives the following list of the fossils occurring in the Irish 
beds : — 
Cenomanien. Turonien. Senonien. 
Terebratulina striata ... ... - - 
Terebratula Hibernica ;:c - 
„ obesa 
„ semigiobosa - 
