30 



bulletin: museum of comparative zoology. 



If the continuity of the two sets of beds could be seen, I should expect 

 them to come together in some such manner as this : 



Fig. 10, Section showing the relation of Guadalupe Hill to the Gamella 

 beach near Rio Formoso. 



Unfortunately no fossils have been found in these rocks. 



Three hundred metres upstream from the mouth of Rio Maragog]f, 

 S. lat. 9°, 3', on the south side of the stream, there are fragments of a 

 dark soft sandstone very like some of the beds here described, but these 

 beds contain a few shells, especially Venus. In the absence of these 







'^ '^'^ ^s'\'W^^^'if^ 



^-tt=.- 



"■*H.;;^ii(!4ki^'.. 



Fig. 11. Example of erosion on the beach, Gamella. From a photograph. 



shells I should have classed it with the snuff-colored beds ; in the pres- 

 ence of them I took them to belong to the stone reef rocks, — a dis- 

 tinction that will perhaps give a good idea of the lack of data for the 

 palaeontologic classification of these rocks. 



On the Rio Sergipe, nine kilometres west of the city of Aracaju, S. 

 lat. about 10° 52' 30", beds similar to those above described are exposed 



