676 REVIEWS AND BOOK NOTICES. 
The Serra of Ereré forms.a part of the southern boundary of 
the plain. On its, east, between the serra and the igarapé, is a 
plateau, made up, at least in part, of obliquely laminated beds of 
Fig. 93. 
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Serra of Ereré from the North. 
tinted sands and clays. ‘The serra is a high, narrow, rugged, 
irregular ridge, four or five miles long, trending about east-north- 
east. and west-south-west, and with abrupt and often precipitous 
sides.” The top of the ridge is very irregular, composed of heavy 
beds of sandstone which are often exposed in ledges, or lie strewn 
Fig. 94. 
Serra of Ereré from the East. 
about the surface in huge blocks. The sandstones form 4 nee 
bluffs along the upper part of the serra on its northern side, ben 
which the slope is very rapid. At both ends the serra 
