224 Washington — Catalan Volcanoes and their Rocks. 



which furnishes an abundant supply of water, has been sunk in 

 the center. This cone is built up of scoriae, and lapilli exclu- 

 sively, well-defined bedding not being evident. On the south- 

 west slope these materials are heaped up against and over a low 

 fault scarp of Oligocene conglomerate, the beds of which dip 

 at low angles to the southwest, and which separate the products 

 of this cone from the lower massive flow which is exposed 

 along the Fluvia at the picturesque Fuente de San ftoque, at 



Montolivet from the east. 



the beginning of the lava field of Bosch de Tosca mentioned 

 above. 



The second of these volcanoes, Montsacopa, lies north 52° 

 east of Montolivet, and just north of Olot, the summits being 

 about a kilometer apart but the volcanic slopes intermingling, 

 though the juncture is masked by a road and cultivated fields. 

 The height of its southern rim, on which stands the pilgrimage 

 chapel of San Frances, above the base I measured with an 

 aneroid as 66 meters, though Gelabert gives it as 100 meters. 

 The summit is occupied by a well-defined, circular crater, some 



