14 



Annals of the Carnegie Museum. 



waves, forming a horizontal terrace, which is uncovered at low tide. These 

 lower beds all dip landward beneath the bluff at an angle of from five to 

 ten degrees. 



At many places in the beds of shale fragments of plants may be dis- 

 tinguished, but they are so badly ground up that those found are not 

 recognizable. 



J pi 



/^^« A. / ' 



Fig. II. Sections showing the structure, the wave-cut terrace, and the granite 

 boulders at Morro de Camaragibe. The dip is somewhat exaggerated. 



At Riacho Doce the village stands upon a narrow terrace between the 

 sea and the sandstone bluffs which are about 80 meters high at this place. 

 The lowest beds which are visible are heavy conglomerates containing 

 large granite blocks; these are followed downward by sandstones, and 

 these in turn by bituminous shales. The beds exposed on the beach are 



Fig. 12. Ideal section at Riacho Doce showing the relation of the shales and 

 conglomerates to the bluffs west of the town. 



