CONTENTS 191 



Page 



Economic geologj- 255 



Geologic map of Maranhao 255 



Bibliography of the geology of Maranhao 255 



Matto Grosso 256 



Previous investigations 256 



General geology 256 



Economic geology 261 



Geologic maps of Matto Grosso 261 



Bibliography of the geology of Matto Grosso 262 



Minas Geraes • 263 



Previous investigations 263 



General geology 264 



Economic geology 268 



Geologic maps of Minas Geraes 271 



Bibliography of the geology of Minas Geraes 271 



Para 281 



Previous investigations 281 



General geology 282 



Economic geology 282 



Geologic maps of Para 282 



Bibliography of the geology of Para 283 



Parahyba 286 



Previous investigations 286 



General geology 286 



Economic geology 286 



Geologic maps of Parahyba 287 



Bibliography of the geology of Parahyba 287 



Parana 288 



Previous investigations 288 



General geology 288 



Economic geology 289 



Geologic maps of Parana 289 



Bibliography of the geology of Parana 290 



Pernambuco 291 



Previous investigations 291 



General geology 292 



Economic geology 293 



Geologic map of Pernambuco 294 



Bibliography of the geology of Pernambuco 294 



Piauhy 297 



Previous investigations ; 297 



General geology 297 



Economic geology 298 



Geologic maps of Piauhy 298 



Bibliography of the geology of Piauhy 299 



Rio de Janeiro, the Federal District, and Trindude. 299 



Previous investigations 299 



General geology , 300 



Economic geology , 300 



