64 



PERCY QUENSEL 



Fig. 20. Soda trachyte, x 50. Elevation c. i 050 m. Masafuera. 



Fig. 21. Soda trachyte iboiilder,. x 30. Nic. +. Elevation about 400 ni. 

 Tierras Blancas, Masafuera. 



character as the soda-trachyte have now been found at lower levels. Secondly, 

 Skottsberg reached the summit of the island and was there able to establish that 

 basaltic lavas occupy the whole highest part of the island. 



The new find of a rock, closely related to the soda-trachyte from higher 

 levels, was a loose boulder at the foot of Tierras Blancas. According to Skotts- 



