252 



J. 0. Branner — jEolian Sandstones of 



It has already been noted that the wind-bedding of these 

 sandstones upon Ilha do Meio is, continued beneath the water 

 at low tide, and that the island is now lower than it has been 

 at some time in the past* (see fig. 2). It may be of some cor- 

 roborative interest, at least, to state that the writer had reached 



Caverns cut by the surf on Ilha Raza. 



a similar conclusion before having seen this opinion of Mr. 

 Buchanan. Other facts, however, show that the island has ex- 

 perienced other changes of elevation than this single depres- 

 sion. That the rocks forming Ilha do Meio, Ilha Rapta, Ilha 

 Raza, and the solitary block between the main island and Sao 

 Jose known as a O Chapeo" are wind-bedded there can be no 

 question. In the cases of the sandstone east of and lying 

 against the base of Atalaia Grande, and that on the south side 

 of the Bahia do Sueste, the wind-bedding is even more clearly 

 shown. In the rocks of Ilha do Meio, Ilha Rapta, Ilha Raza, 

 and in the Bahia do Sueste, this peculiar bedding is continued 

 beneath the water line, showing, as Mr. Buchanan suggests, 

 that the island has once stood at a higher elevation. 



* The Voyage of the Challenger, by Sir Wyville Thomson, N. Y., 1878, vol. 

 ii, p. 100 et seq. The opinion is credited to Mr. Buchanan, and the island is spoken 

 of as Booby Island. 



