This paper deals with anatomical and paleoecological studies of Upper Pleistocene fossil wood specimens collected from the Tietê river old alluvial deposits (Itaquaquecetuba, São Paulo city). Astronioxylon mainieri, Piptadenioxylon chimeloi, Myrocarpoxylon sanpaulense, Matayboxy-Ion tietense and Qualeoxylon itaquaquecetubense are the new genera here described. Paleoecological significance of this association related to tropical humid climate, considered in previous study on similar type fossil woods from Pinheiros river old alluvial deposits, was here confirmed.
