Sevgipe, and Alagoas, Brazil. 



625 



and between 89 and 91, and at many places south of kilometer 84. 

 But inasmuch as the later plateau beds end just east of Agua 

 Fria, and as the Estancia beds do not appear on Rio Itapicuru 

 just north of Timbo, or on Rio Real north of Barracao, it 

 seems evident that they lie in a basin that extends eastward 

 from Aracy to and beyond Estancia. The southern edge of 



Fig. 9. 



Fig. 9. North-south section from the village of Pedras to Aracy showing 

 the Estancia beds overlying granites. 



this basin is overlapped by later deposits, but it seems to be 

 close to a line drawn between Serrinha and Estancia. 



In June, 1907, I made a trip from Bahia to Rio Itapicuru 

 north of Timbo, expecting to find these Estancia rocks exposed 

 along that stream. The Itapicuru at Engenho Brauna, on the 

 road between Timbo and Barracao, was found to run over 

 granites and crystalline schists, while the overlying sedimentary 

 beds forming the plains are Cretaceous or Tertiary. Evi- 

 dently then the seaward margin of the Estancia beds swings 

 inland south of Estancia and does not appear beneath the Cre- 

 taceous beds on Rio Itapicurii where that stream is crossed by 

 the Timbo-Barracao road. 



Fig. 10. 



Fig. 10. North-sonth section across Rio Itapicurii at Engenho Brauna, 12 

 kilometers north of Timbo, State of Bahia. Mesozoic sediments forming the 

 plateau rest upon granites, gneisses, and schists. 



Reports regarding the character of the rocks in the vicinity 

 of Patamute in the northeastern part of the state of Bahia 

 lead me to suppose that the Estancia beds occur in that part of 

 the state. 



Beds that appear to belong to the Estancia series have been 

 seen by me at many places west of the railway running from 

 Bahia to Joazeiro. 



West of Campo Formoso on the watershed between Rio 

 Itapicuru and Rio Salitre drainage I found at several places a 

 basal conglomerate and reddish sandstone that closely resemble 



Am. Jour Sci. 

 44 



-Fourth Series, Vol. XXXV, No. 210.— June, 1913. 



