Ch. XXXI.] 



VOLCANOS OP CATALONIA. 



531 



neighborhood of Naples, a series of volcanic products might be detected 

 of every age from the Older Pliocene to the historical epoch. 



Catalonia. — Geologists are far from being able, as yet, to assign to 

 each of the volcania groups scattered over Europe a precise geological 

 place in the tertiary series ; but I shall describe here, as probably refer- 

 able to some part of the Pliocene period, a district of extinct volcanos 

 near Olot, in the north of Spain, which is little known, and which I visited 

 in the summer of 1830. 



The whole extent of country occupied by volcanic products in Cata- 

 lonia is not more than fifteen geographical miles from 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 are 

 represented as extending eastward in the map, are formed simply of two 

 lava-streams — those of Castell Follit and Cellent. 



Fig. 666. 



Volcanic district of Catalonia. 



Dr. MacClure, the American geologist, was the first who made known 

 the existence of these volcanos j* and, according to his description, the 

 volcanic region extended over twenty square leagues, from Amer to 

 Massanet. I searched in vain in the environs of Massanet, in the Pyre- 

 nees, for traces of a lava-current ; and I can say, with confidence, that 



* Maclure, Journ. de Phys., vol. lxvi. p. 21 i), 1808; cited by Daubeny, Do 

 ecription of Volcanos, p. 24. 



