12 



SOPER— GEOLOGY OF PARAHYBA 



there is an exposure of yellow, coarse-grained sandstone with beds 

 almost horizontal or dipping gently toward the sea. Fifteen kilo- 

 meters further south there is a blufif about 3 meters high composed of 

 a sandy clay, white, brown, and reddish colors. It very much 

 resembles the blufif noted near Lagoa dos IMattos. 



-_-^-_ E --- 



•v'.'- — „in ■ ._^- 



1) 



.12 

 13 



14 



13'. 



Fig. 3. The log of a typical well drilled in Natal, Rio Grande do Norte. 



1. Fine sand and clay. 



2. Yellow sand. 



3. Sand and clay. 



4. Sand and clay with quartz pebbles. 

 5- Clay. 



6. Sand and clay. 



7. Sand and clay with quartz pebbles. 



8. Clay. 



9. Sand and clay with quartz pebbles. 



10. Yellow sand. 



11. White sand with clay. 



12. Yellow clay with sand. 



13. Red sand with clay. 



14. Coarse sand with clay. 



15. Coarse sand. 



These deposits of sediments stretch in an unbroken strip from 

 near Aracaty and probably further north, to Recife and probably 

 further south. Their width varies : At Mossoro it is about 35 

 kilometers, at Macau 22 kilometers, at Ceara Mirim 25 kilometers, 

 at Natal about 20 kilometers and at Parahyba about 20 kilo- 



