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Contribution a l'etude geomorphologique du nord-est du Bresil

1961; EDP Sciences; Volume: S7-III; Issue: 5 Linguagem: Inglês

10.2113/gssgfbull.s7-iii.5.492

1777-5817

André Meunier,

Fish biology, ecology, and behavior

Abstract A region of 40,000 km <sup>2</sup> in the States of Pernambuco, Paraiba, and Rio Grande do Norte in northeastern Brasil, drained to the north by the Piranhas river and to the east by the Paraiba river, exhibits a series of Cenozoic erosion levels showing the morphologic characteristics of littoral and interior zones. Rocks of the region are a poorly-known Precambrian complex attributed to the Algonkian. In the semi-arid western half of the region, west of the meridian of Campina Grande, are the Chapadas, Soledad, and Patos levels, respectively at 830-650, 600-550, and 300-250 m elevation. In the eastern half of the littoral region are the Borborema and Umbuzeiro surfaces, the probably Pliocene Tabuleiros gently sloping from 200 to 20 m at the seacoast, and the Itabaiana surface at about 90 m. These features reflect successive border flexures of the Brazilian shield, and progressive accentuation of an enormous fold at depth.