Ch. XXIX.] CALDERA OF PALMA. (329 



Fig. 696. 



Map of the Caldera of Palma and the great ravine, called " Barranco de las Angustias/' From 

 the Surrey of Capt. Vidal, E. ST., 1837. Scale, two geographical miles to an inch. 



torn of the Caldera, and 4000 above the sea, and situated at the pre- 

 cise limit of two geological formations presently to be mentioned. 

 This col also occurs at the level where, in other parts of the Caldera, 

 the vertical precipices join the talus-like, rocky slope, covered with 

 pines. The other or principal entrance by which the Caldera is 

 drained is the great ravine or barranco, as it is called (see b, b', fio-. 

 696), which extends from the southwestern extremity of the Caldera 

 to the sea, a distance of 4-| geographical miles, in which space the 

 water of the torrent falls about 1500 feet. 



This sketch (fig. 697) was taken by You Buch from a point at sea 

 not visited by us, but we saw enough to convince us that several late- 

 ral cones ought to have been introduced on the great slope to the 

 left, besides numerous deep furrows radiating from near the summit 

 to the sea (see the map, fig. 696). The sea does not enter the great 

 Barranco, as might be inferred from this sketch. 



