There are plenty of examples of oral history surviving far longer. The oldest verified oral information is 80100kyr. There were also plenty of examples of indigenous Americans passing down written history. Then, you are throwing around numbers like 10,000 and 12,000 directly under an article talking about mammoths being in North America 5000 years ago. You're all over the place.
And this is the same kind of stuff I was talking about in my other comment. You're saying 'oh sure they were strong and competent hunters, but I can't believe they remembered things or kept a history.'