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J. C. Branner — Estancia Beds of Bahia, 



in June, 19 LI, while on a visit to the interior of Bahia, 1 made 

 a point of visiting the locality for the purpose of making sure 

 of the stratigraphy of the surrounding region in relation to the 

 fossil-bearing beds. 



The accompanying sketch-map, made up partly from the 

 Servico Geologico's map of Bahia by Branner, Crandall, and 

 Williams, and partly from later personal observations, will give 



Fig. 2. 



Fig. 2. Section at Riacho da Cruz six kilometers south to Aracy where the 

 Estancia beds rest against the granites. 



some idea of the general geography and geology of the place 

 and of its relations to the coast geology. 



In order to reach Aracy I left the railway at Serrinha, a sta- 

 tion on the Bahia and S. Francisco railway. Salgada, another 

 railway station north of Serrinha, is somewhat nearer Aracy, 

 but the facilities for getting horses there for the trip across 

 country are not so good. 



Fig. 3. 



Fig. 3. East-west section showing the general geology across the western 

 edge of the Estancia beds south of Aracy. 



Aracy is about thirty-eight kilometers north of Serrinha. The 

 road from Serrinha passes at first over the granites, gneisses, 

 and crystalline schists that make up the Archean complex over 

 most of the northeastern part of Brazil. 



Ten kilometers north of Serrinha I found many water-worn 

 fragments of flint scattered over the surface of the ground. 

 These fragments continue along the road northward and become 

 more abundant as the area of sedimentary rocks is approached. 

 They rest on the eroded surfaces of the decomposed crystalline 

 rocks. 



At and about the village of Pedras, twenty kilometers north 

 of Serrinha, granites are well exposed. North of Pedras the 

 road descends a granite hill near the base of which sandstones 

 rest against the granites. This is the Riacho do Massape Bon- 

 ito or Riacho da Cruz shown in figure 2. The hill to the north 



