426 Lisboa — Permian Geology of Northern Brazil. 



The following program was carried out. I went up the 

 Itapicurii alone as far as Codo, crossed its divide with the 

 Mearim and reached Barra do Corda, and later the Grajahu 



Fig. 1. 



General geologj/ of a portion of 



the states of 



Maranhao and FiauHy. Brazil. 



by 



Miguel A R. Lisboa. 



Scale, 



3 a" 1 " ,to snp .Jf" * 



farna^ua 



5° E. of Rio 



river. Turning to the southeast I crossed the upper Mearim, 

 the Corda, Alpercatas at Mirador, and the upper Itapicuru, 

 and then, after passing through Pastos-Bons, reached the 

 Parnahyba river above Floriano. I then followed this river 

 to Therezina, crossed its divide with the Itapicuru in the 



