392 



THE CRETACEOUS AND TERTIARY GEOLOGY 



archsean at the base of this serra was not seen, being covered by soil and the talus from 

 the abrupt northern face of the ridges. Not far north of this escarpment the gneisses, 

 such as are scan at the base of Itabaiana, crop out. 



From the summit of the Maraba and bearing S. 25° W. is another peak of this 

 same range known as the Urubii, shown in the following cut, having the abrupt north- 



Pico do Uiiibu from Jlaraba. 

 west face and the south-east dip characteristic of the Maraba. From Maraba, Propria 

 on the Rio Sao Francisco is visible in the distance, and to the left of that place, though 

 far beyond the river, appears a broad plateau with its higher face to the inland side and 

 sloping gradually oceanward, but dying out in the Hat country long before the ocean is 

 reached. This plateau was judged at the time and on the ground to be the continua- 

 tion of the cretaceous beds of Sergipe in the Alagoas direction. 



Fig. F. Pico da Serra Grande from Maialja. 



Bearing N. TO" E. the Pico da Serra Grande (Fig. F) is tlic next prominent peak in 

 this range, its beds also apparently dipping south-east beneath the tertiary. Farther 

 away a line of peaks form the north-easterly continuation of this range. 



LITHOLOGIC CHARACTERS. 



No exposures have ever been found of these SergipcAlagoas cretaceous rocks suffi- 

 ciently continuous to make it possible to determine with any degree of satisfaction 

 whether their lithological characters are constant or otherwise, when long distances or 

 wide areas are taken into' consideration. 



Without going into tedious details I may say, however, that all the evidence in my 



