THE AVONIAN OF THE AVON GORGE 
105 
which are rare at the bottom of the subzone. The index fossil, 
Productus hassus, is also somewhat rare here, although it is 
remarkably abundant at the same level on the opposite side of 
the river. 
The thin limestones at the top of the exposure must be 
unearthed from beneath the turf ; when the right bed has 
been struck, splitting a slab open will reveal a surface crowded 
with small Chonetes of the three types cited above. With the 
Chonetes are associated Ehynchonellids, Spiriferids and the 
tails of a small species of ‘ Phillipsia.^ 
The Spiriferids include both Spirifer aff. clathratus and 
Syringothyris aff. cuspidata, but they do not yet play a dom- 
inant part in the faunal assemblage. 
The zonal coral, Cleistopora, has not, as yet, been recorded 
from Ki in the Avon Section, but further search will doubtless 
result in its discovery for it has been found at this level in 
other parts of the South Western Province, as for example, at 
Skrinkle, south of Tenby. 
K2 = Subzone of Spiriferina cf. octoplicata. 
Diagnosis : — 
Spirijerina cf. octoplicata and Cleistopora cf. geometrica occur 
somewhat abundantly at certain levels. 
The Brachiopods cited as diagnostic of Ki are rare or absent. 
Zaphrentis is absent. 
Fauna : — 
Corals : 
Cleistopora cf. geometrica. 
Brachiopods : 
Chonetes cf. hardrensis. 
Orthothetes cf. crenistria. 
Leptaena cf. analoga. 
B r y o z o a : 
Rhabdomeson. 
Monticuliporids. 
Feiiestellids. 
Spirifer aff. clathratus. 
Syringothyris aff. cuspidatu. 
Aihyris Royssii, mut. j8. 
Camarotoechia mitcheldeanensis. 
