4 
i 
a 
E 
4 
: 
; 
Were Pat beet eee sy. Ss, 
ight, Oe et See e lt aa 
Geology and Mineralogy. 465 
bold serras of more complicated structure and of other formations. 
A series of ridges extending across the southern limit of the plain 
- 
comprises the serras of Ereré; Aroxi and Aracuré, the western 
d 
occupies the eastern end of a row of ridges along the northern 
side, and the Monte Alegre plateau completes the enclosure. The 
the rocks are much contorted, are composed largely of Cretaceous 
beds extending downward into the upper Paleozoic formations, 
Carboniferous and Devonian. North of Ereré, they discovered 
0 f i 
Sition.”” An apparent conflict in geognostical and paleontological 
id on Martius, in fact, was the onl: i isitor to the serras. He reported 
: : ly previous visitor 
n Brasili lor Theil, S. 1326), upon the botany of one of the Serras de 
i logy. 
geology 
Bull. Buff. Soc. N. &., ibid., p. 228, e¢ seq. 
sera iie ‘by the writer (Reconn. N. W. Wyoming, 
age, 
ot was su Reco! : 
— Jones, 1874, p. 143) as convenient to apply to beds of the same relative 
true synchronism is uncertain. 
hen 
