Quart. Journ. Geol. Soc. Vol. LVIII, Pl. XXXIX. 
S E 
ss SS 
< Ss 
S = 
ee Ss 
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° cS 
o < 
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= S 
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~% 
© Ss 
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D ~ 
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| ex 
a ap 
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BY 
Fig 
Ss 
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ig 
