H ASEMAN, GEOGRAPHICAL DISTRIB UTION IN SO VTH AMERICA 19 



side of Eio Amazonas and along Eio Tapajos from Itaituba to Aveiro and 

 west to Maueassu at Fractal and Eio Pedra do Barco on the south side of 

 Eio Amazonas ; from the Cordillera Oriental of Peru ; from Lake Titicaca 

 iiear Yampopata and extending south towards Cochabamba at Arque, 

 Bolivia; Santa Cruz., Bolivia, and in the Chapoa Valley at la Ligua, 

 Chili. The locations of these formations are shown on Plate VI. 



Permian 



Permian fossils have been reported from the State of Sao Paulo, Brazil, 

 and this same belt extends south through Parana and Eio Grande do Sul 

 and ends in Uruguay. Permian fossils are also known from a few isolated 

 places in the Andes. The location of these formations is shown on 

 Plate VII. 



Triassic and Jurassic 



The Triassic and Jurassic periods are unknown in Brazil. Triassic 

 and Jurassic fossils have been reported from northern Colombia and 

 Venezuela; from Puerto Puruay and Eio Maranhao of Eio Amazonas, 

 .and are widely spread in the Andes of Peru and Chili at Passo de los 

 Patos, Coquimbo, Copiapo and elsewhere, where they are mixed with fresh- 

 water deposits. The locations of these formations are shown on Plate 

 VIII. 



Cretaceous 



Cretaceous fossils have been encountered in a narrow belt along the 

 Brazilian coast from Ilheos, south of Bahia, to Pirabas, near the mouth 

 of Eio Amazonas. This coastal belt is never more than about 100 feet 

 above the sea level, and its fossils also show that it must not be confused 

 with the inland Cretaceous of northern Brazil which extends north from 

 the State of Bahia across Eio Sao Francisco at Jatoba and widens out in 

 the states of Piauhy and Ceara. This belt is often 1000 or more feet 

 -above the sea level. If the writer is correct in considering a formation 

 (in which he found no fossils, but near where at Curimata fossil fishes, 

 ( ?) Diplomystus, are said to exist) near Lagoa da Paranagua in the 

 State of Piauhy as Cretaceous, then this belt will with all probability 

 later be found to extend as far south as Serra da Tabatinga, but it does 

 not extend into the Jalapao region of northern Goyaz. 



The extreme northwestern extension of this Cretaceous is unknown, 

 and consequently it offers alluring opportunities for future study, 7 be- 



7 This belt may extend northwest into the State of Para, and as far west as the lower 

 Tocantins basin. Mr. Roderic Crandall of the Brazilian Geological Survey has done the 

 most field work on this inland Cretaceous belt, and his views agree in the main with 

 those of the writer. 



