PREFACE 
The discovery of an unknown fossil reptile in 
the strata of Tilgate Forest, induced me to lay 
before the Geological Society of London, a Me- 
moir on the Organic llemains of the Wealden 
wliich had been collected since my last publication 
on the geology of this district. 
By permission of the President and Council, 
that memoir was withdrawn ; and it was suggested 
to me that, as my former works were out of print, 
a volume which should combine the most interest- 
ing portions of the “ Illustrations of the Geology 
of Sussex,” with an account of the recent dis- 
coveries, might be acceptable both to the natural 
philosopher, and the general reader. 
Agreeably to this suggestion the present work 
has been written ; and the kind and liberal manner 
in which the proposals for its publication have 
been received by so many distinguished and 
learned characters, who have thus testified an 
interest in my researches, has afforded me the 
highest gratification and encouragement 
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