203 J. C. BRAXXER OUTLIXES OF THE GEOLOGY OF BRAZIL 



M. Alcicle D. D^Orbigny/' tome III, 3^ partie, Geologie, Paris, 1842. 

 The map shows all of South America on a scale of 1 to 18,333,333. The 

 geology is not shown in the nsnal way, but shaded areas represent the 

 continent without geographic details subsequent to four geologic periods, 

 namety, "apres les terrains siluriens,'^ "apres les terrains carboniferes,'' 

 "apres les terrains triassiques," and "apres les terrains cretaces." This 

 chart, however, is a geologic diagram rather than a geologic map of 

 South America. 



Francisco Foetterle, 185J/-. — The next geologic map of Brazil of which 

 I have any knowledge is that of Francisco Foetterle. It is entitled "Golpe 

 de vista Geologico do Brazil, e de algumas outras partes centraes da 

 America do Sul promptificado no Instituto Geologico Imperial Eeal Aus- 

 triaco fundado e dirigido pelo Professor Guilherme Haidinger por Fran- 

 cisco Foetterle em Vienna em Avril 1854." 



This map was made for Dr. K. Fr. Ph. von Martins, the Brazilian ex- 

 plorer, by Dr. Franz Foetterle, who was at the time an assistant on the 

 K. K. geologischen Eeichsanstalt. I had the good fortune to see the 

 original of this map at the rooms of the Geological Society of London in 

 1904. The author had made himself familiar with most of the data pub- 

 lished up to that time on the geology of Brazil and of the adjacent re- 

 gions. Altogether it is a remarkable map, evidently made by a discrimi- 

 nating and painstaking person. In the title itself are given the names 

 of the authorities consulted, and, besides the geolog}^, there are many 

 marginal notes on elevations and historic data of interest. The geology 

 is shown entirely across the South American continent, from 5 degrees 

 north latitude to 35 degrees south latitude. 



The scale is 1 to 15,000,000 and the geologic coloring shows the fol- 

 lowing divisions: five divisions for granites, gneiss, itacolumite, and 

 schists (chloritic and traumatic) ; Silurian, Devonian, amphibolite, lime- 

 stone. Carboniferous, Trias, marl, red sandstone, volcanics. Tertiary, 

 diluvium (pampas), and special signs for gold, diamonds, iron, and coal. 



In the light of our present knowledge of the geology of Brazil, Foet- 

 terle's map must be regarded as having but little more than a historical 

 value. 



Franz Foetterle, 1856. — In Petermann's Mittheilungen, Gotha, 1856, 

 Franz Foetterle has an article at pages 187-192, on "Die Geologic von 

 Siid-Amerika," which is accompanied by a geological map of the entire 

 continent of South America on a scale of 1 to 25,000,000. In so far as 

 Brazil is concerned, it is a repetition of his map of 1854. On this smaller 

 one he shows fourteen geologic divisions. 



