OFTIIK SEIiCarK-AI.AfJitAS RASrx OF RIIA7.IL. 



40^ 



It will be observed uijon tbe small map on this page that, besides the small basins 

 along the Biazilian coast, there are, leaving the Purus exposures out of account, two 

 mesozoic localities at some distance from the coast, one at and about Crato in Ceani, 

 another about Taearatu, a short distance above Paulo Alfonso, in the valley of the 

 Kio Sao Francisco, 



The cretaceous beds of the Sergipc-Alaguas basin overlie paleozoic rocks, those 

 of the Sao Francisco basin appear to ovei'lie metamorphic rocks, which may be either 

 paleozoic or archiean, while the Ceara beds overlie slates which ai'e pi'obably paleozoic. 

 The region separating the Sergipe-Alagoas ex- 

 posures from those of the Sao Francisco l)asin 

 are granitic and metamorphic, while metamor- 

 ])hic rocks lie between the Ceaia exposures and 

 the sea coast. If we take into consideration the 

 cretaceous basin of Bahia we find that also sep- 

 arated from the exposures of the Sr>o Francisco 

 basin by crystalline and metamorphic rocks. 



Gardner reports fossil fishes in the vicinity 

 of Jaidim. a town south-east of Crato. The 

 serra de Tacarati'i on the northern side of the 

 Kio Sao Francisco above the falls of Paulo 

 Affonso is saitl by Mi-. Derby to be composed of 

 rocks of secondary age. This serra is about one 

 hundred miles south-east of Jardim, but Mr. 

 Derby says* that " these secondary dej^osits be- 

 come more continuous and form a long line of 

 hills, which beginning with the sena de Taca- 

 ratii stretches away into the interior of the province of Pernambuco." The iiUer- 

 vening country has not been examined, but it seems highly probable then that the 

 Tucarutii beds are the southern extension of those of Crato and Jardim. 



As nothing is known of the details of the mesozoic geology of the Mossoro 

 l)a>in, nothing can be ventured regarding it fnither than that its proximity to the 

 Crato exposures natiu-ally suggests that the beds of the two localities are identical, 

 the intervening beds having, in all probability, been removed by erosion. 



Mr. Derby intimates that there is something pueuliar about the relations of 

 the coastal mesozoic beds to those of the interior. The ohjeetion olTcMed by him to 

 the correlation of the Ceara and the Sao Francisco valley beds with those along the 



* Arcliivos do Miiseu Xiirioniil, Vol. IV, p. 92. 

 A. T'. S — vol.. XVT. 2z. 



EA&TiitN Brazil 



THE 016T«I8UTION 

 or THL 



