The river cut through a series of rises then plateaux forming wide plains covered with shells and shingle, and Darwin discussed with FitzRoy his interpretation that these terraces had been shores that had gradually raised in accordance with Lyell's theories.
Râul trecea printr-o serie abrupturi, apoi prin platouri care formau câmpii largi acoperite cu scoici și prundiș, iar Darwin a discutat cu FitzRoy interpretarea că aceste terase fuseseră țărmuri care s-au ridicat treptat în conformitate cu teoriile lui Lyell.