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c of relati vo sea-lcvel fluct uatio ns durin g t he Upper Quat ern ary are repr esen ted by nurncrou s geological, bio logica l, and pre-historical (shell-midd ens) re cord s foun d along th e Brazilian coast líne. Aba ut 700 of th esc rccord s, dated most1y by the radiocarbon method , are d istrib ut cd t hrough th e Stat es of Alagoas, Sergipe. Bah ia, Esp írito Santo, Rio de Janeir o, São Paul o, Paraná, and Santa Cata rina. T he coasta l plains of th ese states , representing about 50% of th e Brazilian coast, havc beco geo logically mapped , in part or entlre ly during t he last lO years. Th e geological map s are accompan ied by sea levei fluctuati on curves for the past 7,000 years for the Stat es of Bahia (Salvador, Ilhéus, and Caravelas sectors), Rio de Janeiro (Angra dos Reis sector), São Paulo (Santo s and Cananéia-Iguape sectors), Paraná (Paranaguá sector) and Santa Catarina (Itajaf-Laguna sector). These informations allowed us t o kno w that th e relat ive sca levei fluct uations during t he last t housand years played a very importan t role in th c constru ction of the Brazilian Coastal plains. It was alsc demon strated th at th e relative sea levei fluctu at ions during thc Upper Quaternary have been important for th e constru ction of t he river mouth coasta l plains of São Francisco (SE/AL), Jequitinhonha (BA), Doce (ES) and Paraíb a do Sul (RJ) rivers, whose evolutionary histories were quite different in relation to th e classical delta plains prcsent ed in th e geological literature.

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