70 J. C. BRANNER GEOLOGY OF NORTHEAST COAST OF BRAZIL 



many exposures show the rocks to be banded gneisses or schists. This 

 ribbed nature of the rocks is well brought out on weathered exposures. 

 In the Rio Ipojuca, at and near Escada, and at Limoeiro, the exposures 

 show this bedding or schistosity to have an east-west strike. The same 

 east-west strike is shown over the exfoliated bosses. half a kilometer east, 

 and again west of Aripibu. station (kilometer 78). A short way east of 

 G am elleira station (kilometer 95.7) the rocks exposed look like granites, 

 and east of Agua Preta (kilometer 113.6) station the rocks are massive 

 like granites. About Palmares (kilometer 124.7) the rocks have a banded 

 structure rather more marked than that of gneiss. At the bridge west 

 of the station the structure is well exposed in the bed and on the sides 

 of Rio Una. The strike here is northeast-southwest. At Pirangy (kilo- 

 meter 129.7) the rocks are decomposed ; the northeast-southwest strike 

 of the beds (or schistosity) is plain. 



Between Boa Sorte and Gatende the strike is northeast-southwest. 

 One kilometer west of Catende the strike is again northeast-southwest. 

 Between Catende and Jaqueira the same strike is exposed in the bed 

 and along the sides of Rio Pirangy. 



At Marayal station (kilometer 163.8), 10 meters above the stream, 

 the schistose rocks, with pegmatite dikes, strike north 20 degrees east 

 and dip south 70 degrees east; farther west, however, the strike changes 

 back to northeast-southwest, while at Florestal (kilometer 167.8) the 

 dip is northeast about 30 degrees. Four kilometers above or west of 

 Florestal the rocks in the river bed strike northwest-southeast. Three 

 kilometers east of Barra da Jangada schistose rocks dip northeast 40 

 degrees; 2 kilometers east of Barra they*dip south 30 degrees east. At 

 and just west of Sao Benedicto (kilometer 183.7) the rocks are schistose, 

 with a north-south strike and an east dip of from 80 to 90 degrees. About 

 a kilometer west of Sao Benedicto there is either a dike or vein of bTuish- 

 bl ack rock exposed in the railway cut. One kilometer east of Quipapa 

 schistose rocks have an east-west strike. 



About 150 meters east of Quipapa (kilometer 197.3 ; elevation, 427 

 meters) dark mica-schists (?) are well exposed by the track and strike 

 nearly east-west. On the watershed west of Quipapa the rocks have a 

 local strike of nearly north-south and dip east. Two kilometers east of 

 Agua Branca schistose rocks dip east 40 to 45 degrees. The rocks between 

 Quipapa and Agua Branca are faulted and somewhat wrinkled. Be- 

 tween Glycerio and Canhotinho the mica-schists dip to the southeast. 



At Canhotinho (kilometer 227.9 ; elevation, 497 meters) the gneiss is 

 cut by numerous quartz veins. Three hundred meters west of the sta- 

 tion the rocks are crystalline schists striking north-south (?) and cut by 

 numerous quartz veins. 



