GEXEEAL AXD ECONOMIC GEOLOGY 301 



and port works, not only of Rio de Janeiro itself, but on the architecture 

 of all of the coast cities of Brazil as well. 



In the Archean area there are cr3'stalline marbles which, though as yet 

 but little used, must in time come into the market, both for building and 

 ornamental purposes, and also for the production of lime and possibly of 

 Portland cement. Such limestones are known at Macuco and Santa Rita 

 near Catagallo, on Rio IMuriahe above Caxoeira, at Sant' Anna north of 

 Rezende, near Barra Mansa, and near Barra do Pirahy, and in the moun- 

 tains east of Belem. 



It is possible that in the areas of Tertiary lake deposits near Barra 

 Mansa and Rezende there may be found bituminous shales similar to 

 those at Taubate. 



Geologic Maps of Bio de Janeiro 



Pissis, 18^1:2. — In 1842 A. Pissis presented to the Academy of Sciences 

 of Paris a "Memoire sur la position geologique des terrains de la partie 

 australe du Bresil," etcetera, and that paper was accompanied by a geo- 

 logic map that embraced the region between the city of Bahia on the 

 north and east and Piracicaba, in the province of Sao Paulo. It there- 

 fore included the entire provinces of Rio de Janeiro and Espirito Santo 

 and large parts of Bahia, Minas, and Sao Paulo. The map was on a scale 

 of 1 to about 2,500,000. The geologic divisions were : one for fine- 

 grained granite; four for the ^'^terrain primitif"; two for the "periode 

 phylladienne" ; one for diorite, and two for the Tertiary. The map and 

 the accompanying sections show a correct acquaintance with local details 

 of the geology at many points, but the generalizations for the large areas 

 embraced are far from correct; nor do they give a clear idea of the gen- 

 eral geology. 



Alberto Betim Paes Leme, 1912. — In his pamphlet entitled "Os 

 gneisses do Rio de Janeiro," published at Rio de Janeiro in 1912, Dr. 

 Alberto Betim Paes Leme gives a geologic map covering an area of 175 

 square kilometers in the State of Rio de Janeiro, including part of the 

 city of Rio and the region 18 kilometers to the west of it. The map is 

 on a scale of 1 to 50,000, four divisions of the granitic rocks are sho^vn, 

 and the diabase is put in diagrammatically. 



Bibliograyliy of tlie Geology of Rio de Janeiro 



J. C. Branner : The supposed glaciation of Brazil. Journal of Geology, vol- 

 ume I. pages 7.5.3-772. 8°. Chicago. 1893. 



John C. Branner : Decomposition of rocks in Brazil. Bulletin of the Geolog- 

 ical Society of America, volume 7, pages 2.55-314. Rochester, 1896. 



XXI.— Bull. Geol. Soc. Am., Vol. 30. 1018 



