The numerous archaeological invasive surveys carried out over the last 20 years in the Selle valley document the complexity of the alluvial formations in the alluvial plain. The Weichselian coarse deposits are present everywhere. Fine deposits (sand, silt, clayey silt) correlable to the Pleniglacial or the Oldest Dryas often cover them. The Lateglacial sedimentation is unevenly distributed: a channel in which an organic sequence was deposited is preserved in places while deposits from the Younger Dryas spread in the valley mainly upstream. Downstream, the remains of the Final Palaeolithic (Federmesser Culture or Azilian), well dated from Allerød, and the Mesolithic are often found at the same level, testifying to the weakness of sedimentation in the Younger Dryas outside of channels. Peat formation is widespread: starting in the Preboreal in the channels, it then extends onto the slopes, except upstream where it remains more spatially restricted. Thick tufa deposits unevenly distributed in the valley floor remain poorly dated. Numerous occupations attributable to the Paleolithic of Federmesser Culture and to the Mesolithic were found during these surveys. Federmesser sites are contemporary with a valley bottom that has not yet been fully infilled. Remains have been collected in numerous locations on gravel mounds resulting from the deposition of the pleniglacial coarse fluvial gravels and/or next to active channels. Mesolithic occupations also generally took place on high points near watercourses. During the Preboreal and Boreal chronzones, the extension of peatlands led to a shift of call points and Mesolithic sites towards the slopes which were later largely eroded. The oldest occupations are therefore the most deeply buried. Archaeological digs did not follow almost all of these discoveries, due to difficult-to-access levels and construction works that are (theoretically) unlikely to destroy ground in depth. This publication is first of all an opportunity to present in a detailed and synthetic way surveys data which would otherwise have remained buried in piles of reports.