282 
The Ohio Naturalist. 
[Vol. XI, No. 4,. 
The following section gives the general relations and more 
important subdivisions of the Triassic of Brazil: 
fSerra Geral eruptives 600 m 
Sao Bento sandstones, cliffs 
of red gray and cream 
Sao Bento series colored sandstones 200 m 
(Triassic) Rio do Rasto red beds with 
fossil Reptiles and fossil 
Santa 38 ( trees 100 m 
Catharina \ 
System Passa Dois series 
(Permian) 
Tubarao series 180 m. 
(Permo-Carboniferous) 
The Rio do Rasto beds are composed of loosely consolidated 
red sands and conglomerates, while the Sao Bento beds consist of 
massive red, gray, and cream-colored sandstones which are some- 
times conglomeratic and “often baked and vitrified by contact 
with the great sills of diabase which are so frequently intercalated 
between the massive layers as well as piled on top of the same . 39 
The lower part of these beds (Sao Bento) are mostly red sandstone 
flags and the whole is apparently unfossiliferous. The hard 
vitrified rocks of the upper part of the series frequently form 
walls, towers, and buttes near the summits of the elevated peaks. 
The top of the section is made up of a great series of lava flows and 
the beds beneath are affected by numerous dikes and intrusive 
sheets. 
The coal-bearing strata of southern Brazil is late Paleozoic, 
while that of Argentine and the Chilian Cordilleras belongs to the 
Rhaetic group and is partly covered by conformable marine 
deposits of lower Lias . 40 
The Triassic fossils of the Cordilleran region are of the same 
type as those found in California and western Canada, the leading 
fossil being Pseudomonotis semicircular is (?) Gratt. 
Nearly all horizons of the Jurassic have been found to be 
fossiliferous and “the rich collections made in different parts of 
the Argentinian, Chilian and Peruvian Cordilleras have enabled 
us to determine that the succession of marine organic life during 
this period was quite the same on the Pacific slope as in Europe 
and East India, and there have existed very intimate faunistic 
relations between these regions .” 41 
38. White, I. C., Commissao de Estudos das Minas de Carvao de 
Pedra do Brazil. Relatio Final, 1908, p. 33. 
39. White, I. C., loc. cit., p. 211. 
40. Steinmann, Gustav, loc. cit., p. 857. 
41. Steinmann, Gustav, loc. cit. p. 857. 
. 900 m. 
223 m. 
