230 REPORT—1904. 
Zones Sub-zones and Horizons 
€ 
D,) Lonsdaleia floriformis. 
PSOE ENTE ; : { D,) Dibunophyllum cylindricum. 
VISHAN 
SEMINULA . 
( 
( 
(S,) Productus cora (mut.). 
(S,) Productus semireticulatus. 
Nive 
5 
(Caninia- 
(C) Syringothyris, sp. nov. Zone.)" 
| 
{ (Z,) Schizophoria resupinata. 
ee ' | | (2) Spirifer aff. clathratus. 
TOURNAISIAN 
{ (K,) Spiriferina octoplicata. 
DEEEEOBOP A) 2 . ; 1 (RK) Productus, sp. nov. 
a 
MopIoLa . ‘ : . (M) Modiola lata. 
| 
For example: Productus Cora, P. semireticulatus, and Schizophoria 
resupinata range as high as the upper 300 feet of the Pendleside Series 
in Cheshire. The first two fossils occur in the Calciferous Sandstone 
Series of Fife, P. Cora in the Ardens limestone, and P. semireticulatus 
and Schizophoria resupinata all through the Calciferous Sandstone Series. 
All three of these fossils occur throughout the Yoredale Series of Wens- 
leydale. 
Spirvferina octoplicata is found with all the above species at Castleton 
and Park Hill, Derbyshire, in the upper beds of the series, and in Fife 
is found throughout the Carboniferous Limestone Series and as low down 
as the encrinite bed in the Calciferous Limestone Series. 
Lonsdaleia floriformis is not found in the upper beds of the limestone 
in Derbyshire, but in the main or great limestone of Weardale occurs 
with the three forms of Brachiopoda mentioned above. 
Dibunophyllum cylindricum occurs in the Lower Limestone Series of 
the West of Scotland with Lonsdaleia floriformis, and also some way 
down in the Upper Limestone Series of the North-west of Ireland. It 
will be a curious anomaly if the distribution of the species in the isolated 
patch of Bristol and the Mendips is totally different from that which 
obtains in all other districts of Great Britain. 
Up to the present I have looked in vain for any species of organism 
which denotes a definite Horizon in the Carboniferous Limestone Series of 
Great Britain. 
It must be noted that in Belgium the Viséan is characterised by the 
presence of Productus giganteus, a shell absent in the Tournaisian. 
1 Employed throughout the preliminary working system. 
