147 
Cycles of Sedimentation in the Eocene. 
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gion of 
rth France and Belgium. The trans- 
Deposits of the earliest zone are not found in the main re 
the Paris Basin, but only in No 
gression continued later, so that the basal de 
posits in the extreme 
The beds of the highest 
In the Paris Basin they 
racheux and the Sables de Chalons-sur- 
Professor Leriche has prepared a very instructive series of 
) 
ere 
BS 
part of the Paris Basin belong to the zone of 
Pholadomya Konincki (Tuffteau de La F 
north-eastern 
zone occur over a far more extensive area. 
are known as the Sables de B 
Vesle. 
