GENERAL AND ECONOMIC GEOLOGY 251 



all that was translated and includes volume I of the French edition and 

 chapter XI of volume II, up to page 206.) 



J. W. RicHAEDSON : The Espirito Santo and Bahia Monazite beds. Brazilian 

 Mining Journal, volume I, pages 79-84, Rio de Janeiro, July, 1903. 



AuGUSTE DE Saint-Hilaiee : Voyage dans le district des diamans et sur le lit- 

 toral du Bresil. Two volumes, 12mo. Paris, 1833. 



GOTAZ 



Previous investigations. — The base map of Goyaz is made up partly 

 from the coordinates along the Eio Araguaya by Dr. W. Berky for the 

 Department of Terrestrial Magnetism of the Carnegie Institntion and 

 partly from the map of the Commissao de estado da Xova Capital da 

 Uniao, under Dr. L. Crnls, Eio, 1896. 



The location of the Tocantins and the Paranan is taken from the Bra- 

 zilian government's map of the prolongation of the Estrada de Ferro 

 Central do Brasil do Rio a Belem, 1917. 



The report of the expedition of Castelnaii across Goyaz and of his trips 

 on the Araguaya and Tocantins contains many notes on the geology, 

 though it is often difficult to locate the places mentioned. George Gard- 

 ner's travels and Pohl's Gebirgsknnde Brasilien are also very helpfnl. 



The report of Crnls on the Planalto Central do Brazil has important 

 notes on the mineralogy, and on the geologic strnctnre, by Hnssak. 



In the northwest corner of Goyaz, where it touches the State of Para, 

 I have felt obliged to omit the Cretaceous beds along the Araguaya, as 

 shown by Katzer in his map of the geology of Para. 



General geology. — The Archean rocks in the State of Goyaz extend 

 from Rio Parnahyba, southwest of Santa Rita do Parnahyba, and from 

 south of Catalao northward past Bella Vista, Pyrenopolis, and the city 

 of Goyaz to Porto ISTacional, on the Rio Tocantins — a distance of more 

 than eight hundred kilometers. This Archean belt has a width of four 

 hundred or five hundred kilometers, more or less. The details of the out- 

 lines of the area shown on the map, however, make no claim to accuracy, 

 while the limits of the Archean along the western side of the state are 

 almost entirely unknoT^ni. There are a few small Archean areas exposed 

 where the overlying, rocks have been removed by denudation. One of 

 these is reported by Gardner at Natividade. There appear to be areas of 

 infaulted old Paleozoic rocks within the area of Archean rocks in the 

 region about the city of Goyaz and elsewhere, but, for lack of a knowl- 

 edge of details, it is quite impossible to outline any of them at present. 



There seems to be an area of old Paleozoic rocks about the headwaters 

 of Rio Araguaya, but very little is known either of the character of the 



