THE JURASSIC AND CRETACEOUS EPOCHS. 
11 
However^ we will not dwell at too great length upon the pro- 
ductions peculiar to this epoch, either in the animal or vege- 
table kingdoms ; these are subjects with which the geologist is 
already well acquainted, and which do not require repetition. 
The Cote-d^or affords another example of a displacement which 
was of very general extent, and which contributed to raise the 
Jurassic series of strata above the water-level, and with this the 
dispositions and form of the continents underwent considerable 
change. (Plate I. fig. 1.) 
If the three great islands of the preceding epoch were joined 
together this would present but an imperfect view of the al- 
terations effected by the change alluded to. Brussels, which 
had been situated inland, was now near the sea ; Arras, Dun- 
kirk, Maestricht, W esel, Breslaw and Vienna were situated be- 
neath the water ; a lake was formed between Dresden, Brunn 
and Prague ; a strait existed over the present sites of Perpignan 
and Carcassone ; and what existed of the Pyrennean district was 
now submerged. 
The Vosges, which in the preceding epoch formed the sea- 
boundary, now existed in the interior of a large continent which 
was connected with the central island of Prance — the strait 
which separated them during the preceding period was now filled 
up. Langres, Nevers, Lyons, Toulouse and Oxford existed on 
" terra firma," and an isthmus was formed in the neighbourhood 
of Poictiers connecting the central land with that situate to the 
west. A boundary of land extended from Cracow to Perpignan, 
by way of Batisbon (unchanged in its relative position in the 
former period), Zurich and Lyons. 
An immense bay existed between Brussels and Oxford, and 
extended southwards as far as Poictiers. 
Between Saltzburg and Avignon another new island was 
formed which represented the locality of the Alps ; Briancon, 
Turin, Trente, and Inspruch existed, but Switzerland was occu- 
pied by a canal which separated the island in question from the 
c 2 
