GEOLOGIC MAPS 201 



J. E. ^Vappaeus, ISSJf. — ''A geographia physica do Brasil" (Edigao 

 condensada), Rio de Janeiro, 1884. This work contains a chapter by 

 Orville A. Derby on the structural geology and minerals of Brazil. The 

 text forms chapter A^, pages 44 to 59, and it is accompanied by a sketch- 

 map made by Derby showing the geology of Brazil, The scale is very 

 small (about 1 to 90 millions) and the geological column is shown in six 

 divisions, namely: Archean, Paleozoic, Carboniferous, Trias (?), Creta- 

 ceous, and Tertiary and Quaternary (combined). 'No attempt is made, 

 however, to show these subdivisions over more than about half of the area 

 of Brazil. The text accompanying this map is based partly on Derby's 

 personal knowledge, but no references are made to the other sources of 

 information used in the preparation of the map. 



Dr. Hermann Bergliaus, 1S92. — "Atlas der Geologic" (Berghaus' 

 Physikalischer Atlas, Abteilung I), Gotha, Justus Perthes, 1892. Plate 

 number 14 shows the geology of the whole of South America; it seems 

 to have been compiled chiefly by Dr. G. Steinmann. It is on a scale of 

 1 to 30 millions. There are eleven subdivisions of the geologic column, 

 as follows: (1) Archean, (2) 3^ounger eruptives, (3) crystalline schists, 

 (4) Paleozoic, (5) coal beds with Glossopteris flora, (6) Jura and Trias 

 (not in Brazil), (7) Mesozoic, (8) Cretaceous ( ?), (9) basic eruptives, 

 (10) Tertiary, (11) Quaternary. 



Domicio da Gam a, no date. — In his "Atlas universal de geographia 

 physica e politica, nova edigao correcta, por Domicio da Gama, Rio de 

 Janeiro," no date, the author gives on plate 32 a geologic map of Brazil. 

 This map has not been seen by the present writer. 



Bai'do Homem de Mello e Dr. Francisco Homem de Mello, 1909. — 

 "Atlas do Brazil," Rio de Janeiro, 1909. A plate entitled "Esboco da 

 carta geologica do Brazil," on a scale of 1 to 19 millions, represents the 

 general geology of Brazil. There are only four colors used for the geol- 

 ogy, as follows : Archean and Lower Paleozoic, Middle and Upper Paleo- 

 zoic, Mesozoic, and a single color for both Tertiary and Quaternarv. No 

 author's name is given on the plate, nor does the text make any mention 

 of the name of the person responsible for the geology shown, but Barao 

 Homem de Mello informs me that it was prepared for him by 0. A. 

 Derby. The fact that no authority is mentioned on the map is probably 

 because Mr. Derby was very cautious about committing himself to the 

 generalizations required for a map of the kind ; and no one knew better 

 than he did the limitations of our knowledge of the geology of Brazil. 



Manoel Paulino CavalcanU, 1910. — A series of maps of Brazil showing 

 climate, agriculture, statistics, and geology was published at Rio de 

 Janeiro in 1910 by the Sociedade Nacional de Agricultura under the 



