Rossetti et al. This formation has been deposited by a high-energy fluvial system, in humid climate, when the paleo-Amazon River fuck Manacapuru to Down in as Sanozama flew from East to West Caputo et al. It crops out in the northern part of the fuck Manacapuru to Down in area, at elevations between 50 and m, near Manaus, Iranduba and Manacapuru. Three boreholes in this area indicated a minimum thickness of 60 m for these Quaternary sediments Silva Farther west, in the region of Manacapuru, the homonymous river lies oriented NW-SE and presents asymmetric channels and drowned mouth the Manacapuru lake. Episodes 13 4: Its relief is low around 50 mwith flat and dissected tops and poorly-evolved drainage.