Scattered over several miles are mummified, rock-hard carcasses of Weddell seals. Radiocarbon dating of the remains is difficult, but scientists estimate that the carcasses are between 2,500 to 3,500 years old. Their travel inland so far from their coastal habitat is somewhat of a mystery.Tsunami? Of course, not having a reliable date (a 1000 year range that recent means there isn't one) makes it difficult to claim a single event, or even a handful of events. Maybe we're dealing with the Thunderbird -- it grabbed the seals, flew up and inland, and dropped 'em to kill 'em, planning to munch 'em later... ;')
Why are Thunderbirds extinct? The thermostat on their freezer was set to defrost every three millenia and that’s a long time between meals.