GEOLOGY OF CENTRAL MINAS GERAES, BRAZIL 375 



remains, these deposits have been referred to the middle or late 

 Tertiary — probably Miocene or Pliocene.' They are distinctly 

 younger than the canga plateau which is therefore certainly older 

 than the Pliocene, and probably older than the Miocene. 



Similar deposits of Miocene or Pliocene clay, sand, and lignite 

 occur near the village of Fonseca,^ east of an extensive canga plain 

 of later age, which occurs along the eastern front of the Serra do 



Fig. 10. — A plain of canga formation, between Santa Rita Durao and Agua 

 Quente. 



Caraga. This younger plain is very conspicuous over the areas 

 of softer formations east of the Serra do Caraga. The canga plain 

 abutting the east foot of the Serra do Caraga between the village 

 of Agua Quente and Santa Rita Durao (Fig. 10) is a particularly 

 well-preserved portion of it. The softer schists, gneisses, and 

 granites east of the present Serra do Caraja had, with the excep- 

 tion of some of the more resistant lenses in the iron formation, been 



^ H. Gorceix, "Bacias terciarias de agua doce nos arredores de Ouro Preto," 

 Ann. da Escola de Minas de Ouro Preto, III, g$-ii4; Rio de Janeiro, 1884; Joaquim 

 Candido da Costa Sena, Ann. da Escola de Minas, N. 10 (1908), p. 17. 



^ H. Gorceix, op. cit. 



