32 
THE LOWER LIAS OF KEYNSHAM. 
The upper portion of our vertical section (all the beds 
above the top of the Calcicosta series) was constructed 
mainly from data supplied by exposure 5. 
II. The sequence immediately south of Keynsham (as shown 
in exposures 6, 7, 8). 
The most noteworthy feature in the development of the 
Lower Lias rocks immediately south of Keynsham is the local 
Ve-rtical 
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expansion of the Bisulcatus beds. A consequence of this 
fact is that, whereas north of Keynsham the beds principally 
