12 



vicinity of Peniambuco. His description ot the interior 

 of tiie province of Bahia, and the upper Sao Francisco 

 basin, are made up largely from the notes of Messrs. 

 St. John, Allen, and Ward of the Thayer Expedition. 

 The volume closes with a valuable appendix on the Boto- 

 cudo Indians. 



From a review of his book, we find that the following 

 geological formations were known, or supposed, to be 

 present in Brazil at the time of its publication : — 



Eozoic. The gneisses, etc., of the plateau of Brazil, 

 including the Serra do Mar, and of the plateaus of Guyana 

 and the Chiquitos region were, at least for the most part, 

 referred to this age. 



Silurian. It was suggested by Hartt that the clay and 

 talcose schists, itacolumites, etc., of the gold regions of 

 Minas Geraes are probably referable to the Silurian. 

 They closely resemble similar formations in Nova Scotia. 

 No Silurian fossils were found. 



Devonian. Unknown. 



Carboniferous. Including the beds of coal, with accom- 

 panying deposits, containing remains of plants, in Rio 

 Grande do Sul. Prof. Agassiz, in "A Journey in Brazil," 

 has referred to the finding of Palseozoic fossils by Major 

 C'outinho on the Lower Tapajos, but it remained for 

 Hartt to afterwards determine their Carboniferous age. 



Triassic {?). A thick series of red sandstone, under- 

 lying the Cretaceous over a large part of Sergipe. No 

 fossils were found. 



Cretaceous. Existing through most of the northern 

 coast provinces, and forming separated basins, partly of 

 marine, parti}' of fresh-water, origin. Fossils had been 

 collected at a few localities. The Cretaceous had also 

 been found on the Rio Purus. 



Tertiary. The clays and ferruginous sandstones of the 

 coast, and of many of the river basins and plateaus, were 

 referred to the Tertiary, although there were no palason- 

 tological evidences as to their age. 



Drift. Prof. Agassiz's ideas of the distribution of 

 drift were mostly accepted, and Hartt adds his own 



