22 THE CARBONIFEROUS LIMESTONE OF BURRINGTON COMBE 
limestones. In the Avon Section, it is not recorded with 
certainty from the Modiola Zone. 
Syringothyris aff. cuspidata has only been recorded 
from the top of this zone. In the Avon Section it enters 
at the top of the bassus sub-zone. 
Note. — Considering the poor exposure of this zone at Burrington, 
the failure to find many of the above fossils cannot be said to prove 
more than their non-abundance. 
B. Zaphrbntis Zone 
Lithological characters. 
This zone includes the series of limestones (with sub- 
sidiary shales) from the first appearance of Zafhrentis to 
Horizon y. The limestones are very encrinital. The 
lower part of the zone is shaly and is cut through by the 
upper part of the Combe, above the bend. 
Exposure. 
The east ravine cuts through the lower part of the 
clathratus sub-zone before opening into the Combe. In the 
west ravine, from Goatchurch Cavern to the Combe, the 
whole of the clathratus sub-zone is rather poorly exposed. 
The massive limestones occurring just above the top of 
the clathratus sub -zone form the fine escarpment which 
towers above the road, on its north side, in the upper part 
of the Combe 
The upper part of the resupinata sub-zone is poorly 
exposed on the slopes below the bend. 
The limestones forming Horizon y stand out prominently 
on the slopes, and are well exposed on both sides of the 
road, about 200 yards below the bend. 
Coral fauna. 
Zaphrentis aff. Phillipsi. 
Zaphrentis aff. cornucopiae. 
Caninia cylindrica. 
Amplexus cf. coralloides. 
