BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 13, PP. 41-98, PLS. 4-15 FEBRUARY 3, 1902 



GEOLOGY OF THE NORTHEAST COAST OF BRAZIL 



BY JOHN C. BRANNER 



{Presented before the Society August #7, 1901) 



CONTENTS 



Page 



Introduction 42 



Geology of the state of Parahyba do Norte 42 



Results of previous and present investigations c 42 



Miss Rathbun's description of Zajithopsis crelacea 43 



Doctor Williston's description of Oimolichthys n. sp 44 



Age and analysis of Parahyba limestone 45 



Coastal sediments 46 



Fossils from sandstone exposures of the coast 46 



General geologic relationships 50 



Results of examination of exposures along the Conde d'eu railway 51 



Conclusions regarding the geology of Parahyba do Norte 57 



Geology along the Pernambuco coast south of Recife 58 



Location and character of the exposures 58 



Trachytes 59 



Granite at Gaibii 60 



Granites and diorite of Cabo Santo Agostinho 60 



Rocks of Santo A leixo 62 



Rio Formoso rocks 63 



Granite of Pedra do Porto 63 



Resume of the geology of the coast south of PernambucoT 64 



Geology along the Recife ao Sao Francisco railway and its prolongation, Sul 



de Pernambuco , 66 



Railway stations and topography adjacent thereto 66 



Rock decomposition 68 



Structural features 69 



Topography of the region 71 



Waterworn graVels 72 



Observations away from the railway 72 



Resume of the geology along the Recife Ao Sao Francisco railway. 75 



Geology along the Estrada de Ferro Central de Pernambuco 76 



Railroad stations 76 



Topography in detail and the rock exposures 77 



Conclusions regarding geology along the Central Railway of Pernambuco. 85 



VII— Bum,. Geot,. Soc. Am., Vol. 13, 1901 (41) 



