 After three days at Bahía Blanca he grew tired of waiting for "Beagle" and on 21 August revisited Punta Alta where he reviewed the geology of the site in light of his new knowledge, wondering if the bones were older than the seashells.He was very successful with searching for bones, and on 1 September found a near complete skeleton with its bones still in position.He set off again and on 1 October searching the cliffs of the Carcarañá River found "an enormous gnawing tooth" then in a cliff of the Paraná River saw "two great groups of immense bones" which were too soft to collect but a tooth fragment identified them as mastodons.