164 BRANNER— THE FLUTING AND PITTING [April 4, 



The cases mentioned by Bauer occur in granites at Point Larue 

 on the Island of Mahe, one of the Seychelle Islands in the Indian 

 Ocean, about latitude 4° 30' south, and longitude 55° east. 



The most impressive examples of the fluting of crystalline rocks 

 that I have ever seen were found in 191 1 near the village of 

 Quixada in the interior of the state of Ceara, Brazil (Plate I.), 

 latitude 5° 5' south and longitude 19° 20' west at an elevation of 180 

 meters above tide. In the vicinity of Quixada almost every elevated 

 exposure of the granites shows more or less fluting. Only those of 

 which the best photographs were obtained are shown in the accom- 

 panying plates. The hills shown in these pictures are from 100 to 

 225 meters high, that is above their bases. Efforts to get photographs 

 of the fluting about Quixada have been only partially successful, as 

 may be seen from the illustrations given with the present paper. 

 Horace E. Williams of the Servigo Geologico do Brazil has sent me a 

 photograph of fluted granites in the Serra de Borborema, 25 kilo- 

 meters south of Campina Grande in the state of Parahyba. 



Other cases that have come to my attention occur in the interior 

 of Ceara, and about the famous Itatiaya, the loftiest peak in Brazil, 

 situated in the extreme northwest corner of the state of Rio de 

 Janeiro. Itatiaya has an elevation of 2,994 meters above tide. The 

 fluting of that peak was mentioned to me many years ago by Mr. 

 Derby, the present director of the geological survey of Brazil,^ but 

 I did not then fully realize the extent and amount of it. 



Recently I received from Dr. Carlos Moreira, of the National 

 Museum at Rio de Janeiro, some photographs made by him of the 

 Itatiaya peaks together with specimens of the rocks themselves. Dr. 

 Moreira spent some forty-five days on and about that peak, and 

 though his photographs are small, they are clear, and they are the 

 best we have thus far seen of the fluting in that particular region 

 (Plate II.). 



Characteristics of the Fluting of Granites. 

 In the fluting of limestones there is generally left at the crest of 

 ^ Bui. Geo}. Soc. Amer., VII., 280, footnote. 



