When European explorers made first contact with peoples around the world both cultures changed. Unfortunately for those being contacted they were changed by a lot of diseases and exploitation (sadly the exploitation continues to this day). Europeans also ignored the long history of the peoples they met and devalued their oral traditions. A recent example of this in Canada is around the discovery of the HMS Terror.
Globally there are many stories that can be traced back to events thousands of years ago. It’s only now that the traditional sciences are listening to these stories because physical evidence can be found using modern techniques.
The extraordinary antiquity of such stories, which represent knowledge passed on largely orally, was not demonstrable until recently. This has allowed the full extent and implications of the longevity of the memories on which these stories are based to be appreciated. Another such oral history surrounds the Klamath people of Oregon, in the western U.S., who tell of a time when there was no Crater Lake, only a giant volcano towering over the landscape where the lake is today. As the story goes, the fractious volcano god, besotted with a local beauty, threatened the Klamath with fury and fire unless the woman acquiesced. But her people called upon their protector—a rival deity—who fought the volcano god, eventually causing his mountain home to collapse in on him and fill with water. For the next approximately 7,600 years, the Klamath taught each new generation the importance of avoiding Crater Lake lest they disturb the evil god within. With remarkable precision, geologists have determined that this is the time of the terminal eruption of the former volcano, Mount Mazama, and the creation of the landscape that exists today. The Klamath were there all along, and their memories of that ancient cataclysmic event have passed into global knowledge today.