THE LOWER LIAS OF KEYNSHAM. 
39 
Unicardium cardioides and Pecten pollux are also not 
uncommon at certain levels in the sub-ammonite beds. 
The Psilonotus zone consists of a bottom, compact lime- 
stone containing Am. planorbis, succeeded by several lime- 
stone beds containing Am. johnstoni and Lima gigantea 
abundantly. 
VertxcA 
4iee.(Lov% 
At the top of these beds Echinid fragments are common. 
The whole series is capped by clays with a few nodular 
beds. 
Detailed section of Loiver Lias near Redland. 
To top of section. Clay with nodular limestone bands. 
/13 inches ; rubblylimestones. ^ 
PSILONOTUS 
ZONE. 
7 inches ; red clay. 
4 inchesi; compact limestone 
^ hand. 
Pseudodiadema (spines and test) 
at top. 
Am. johnstoni. 
Lima gigantea, Lima hermanni, 
Lima hettangiensis. 
Pholadomya glahra. 
Ph. calcicosta and Ph. sp. 
Am. planorbis, Lima gigantea, 
Pinna hartmanni, 
