MIDDLE CHALK- CONDITIONS OF DEPOSIT. 
547 
supposing a direct communication between this sea and a western 
ocean is through Poitou and the Charentes, toward the region of 
the central Atlantic. This view is represented in the sketch-map 
(Fig. 86). So far as we can see, the geography of the western land 
Fig. 87.—Hypothetical restoration of the Geography of the British and 
French regions during the age of the Middle Chalk (Turonian). The 
barred spaces represent land. 
.4-19, N N 
