BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 22, pp. 187-206, PLS. 14-17 MAY 23, 1911 



AGGEADED LIMESTONE PLAINS OF THE INTERIOR OF 

 BAHIA AND THE CLIMATIC CHANGES SUGGESTED 

 BY THEM 1 



BY J. C. BRANNER 



(Presented before the Cordilleran Section March 25, 1910) 



CONTENTS 



Page 



Geological map 187 



Geologic divisions of the state of Bahia 188 



The limestone horizons 188 



Crystalline limestones 189 



The Salitre limestones 189 



The Cretaceous limestones 191 



The Catinga limestones 191 



Salitre Valley 191 



Origin of the Catinga limestones 192 



The climate 195 



The valley of Rio Jacare 196 



The valley of the Rio Verde 190 



Climatic relations 196 



An older Catinga limestone 198 



Resume concerning the old Catinga limestone along the railway 201 



The old Catinga limestone away from the railway 202 



Origin of the Catinga limestone of the Sao Francisco floodplain 203 



Age of the Catinga limestone 204 



Resume of conclusions 205 



Geological Map 



The accompanying geological sketch map shows a large area of lime- 

 stone in the interior of Bahia. The limestones of the region, however, 

 are not all represented on the map, and no attempt is made to show them 

 in detail. This lack of detail is partly due to the scale of tlie map, wliich 

 does not admit of it, and it is partly owing to the fact that their exact 

 distribution has not been worked out over any considerable part of the 

 region. 



1 Manuscript received by the Secretary of the Society April 4, 1911. 



XIV— Bull. Gkol. Soc. Am., Vol. 22, U)10 (ISl 



