390 G. A. Waring — Northeast Coast of Brazil. 



becomes more effective in making slight alterations in the 

 beach line, and in some jjlaces has built out the beach beyond 

 what its position was at the time of its lithification. 



3. Ponta Caicara marks the western limit of the typical reefs 

 or lithified beaches, but at a number of localities farther west 

 similar hardening has taken place. 



4. The iron-cemented Tertiary sands and clays border the 

 coast for practically the entire distance between Ttio Grande 

 do .Norte and Camocim. (They also extend along the coast for 

 many miles beyond these points.) At a number of places the 

 sediments form relatively low but prominent cliffs, but for 

 long stretches they are obscured by beach sands. The lime- 

 stone that underlies the sandy sediments was observed in only 

 two places, near each other. Shales were not seen at all. 



5. Dead coral reefs attached to the land were seen at a few 

 places, the westernmost being a short distance beyond Marcas. 

 They furnish unquestionable evidence of slight elevation of 

 this portion of the coast. 



U. S. Geological Survey, Washington, D. C. 



