184 
OLDER PLIOCENE PERIOD. 
[Ch. XIV. 
north to south, and about six from east to west. The vents of 
eruption range entirely within a narrow band running north 
and south, and the branches which we have represented as 
extending eastward in the map are formed simply of two lava- 
streams, those of Castell Follit and Cellent. 
No. 43. 
Volcanic district of Catalonia. 
Dr.Maclure, the American geologist, was the first who made 
known the existence of these volcanos * ; and, according to his 
description, the volcanic region extended over twenty square 
leagues, from Amer to Massanet. I searched in vain in the en- 
virons of Massanet, in the Pyrenees, for traces of a lava-current ; 
and I can say with confidence that the adjoined map gives a 
correct view of the true area of the volcanic action. 
* Maclure, Joura. de Phys., vol. lxvi. p. 219, 1808; cited by Daubeny, De- 
script ion of Volcanos, p. 24, 
