36 
THE LOWER LIAS OF KEYNSHAM. 
it forms one of the points upon which he relied for the 
relegation of the White Lias to the Lhetic. As fully pointed 
out above, we consider the practical identity of the molluscan 
fauna in this bed with that in the beds above to necessitate 
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the return of the White Lias to the Lias.) Above the Sun 
Bed come the sub-ammonite Ostrea beds, practically identical 
in lithology and palasontology with the beds on the same 
horizon at Redland. Ostrea liassica and Pleuromya crow- 
