Geology and Geomorphology of Holocene Coastal Barriers of by S?rgio R. Dillenburg;Patrick A. Hesp

By S?rgio R. Dillenburg;Patrick A. Hesp

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1995; Gabioux et al. 2005). L. Dominguez isobaths (Beardsley et al. 1995), sediment dispersal is predominantly longitudinal to the shoreline favoring formation of mud capes and banks deflected westwards into the downcurrent direction (Allison et al. 1995; Lefebvre et al. 2004; Plaziat and Augustinus 2004). Additionally the damping effect of these muds results in reduced wave action, and the shoreline is devoid of sand beaches/barriers (Rine and Ginsburg 1985). Fig. 16 The Parnaíba river delta, marks the eastern limit of the Amazon embayment.

Contin Shelf Res 27:1820–1834 Magnavita LP, Silva RR, Sanches CP (2005) Guia de Campo da Bacia do Recôncavo, NE do Brasil. Bol Geoc Petrobras 13:301–334 Martin L, Flexor J-M, Vilas-Boas GS, Bittencourt ACSP, Guimarães MMM (1979) Courbe de variation du niveau relatif de la mer au cours des 7000 derniéres années sur un secteur homogéne du littoral brésilien (nord de Salvador – Bahia). In: Suguio K, Fairchild TR, Martin L, Flexor J-M (eds) Proceedings of the international symposium on coastal evolution in the Quaternary, São Paulo, Brazil, pp 264–295 Martin L, Dominguez JML, Bittencourt ACSP (1998) Climatic control of coastal erosion during a sea-level fall episode.

Major dispersal pathways of sediments along the coast are shown also in Fig. 2. 5 Sea-Level History During the last 420 ka, at least five major sea-level highstands related to interglacial periods are reported (OIS 1, 5, 7, 9 and 11) (Hearty 1998). Sedimentary records of some of these episodes are present along most of the coast of Brazil, with the exception of its northern portion. 1 High Sea Levels Prior to 120,000 yrs BP Sedimentary records (sand terraces and deposits) from the coastal plains of south-southeastern Brazil have allowed the identification of two high sea levels, which were interpreted to be older than 120,000 yrs, based on truncation relationships and other geomorphologic criteria (height) (Villwock 2 The Coastal Zone of Brazil 25 et al.

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