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California's Central Coast Amid The Insanity
The Natchez Indians, in Louis L'Amour's "Jubal".I forget where I read it, but there was some American indian lore of an animal that sounded a lot like a Mastodon.
No reason to not believe that wooly mammoths or mastodons didn't roam round the lower Mississippi River, and that the local Indians of the 1700s (time period of the book, and the waning days of the last ice age) didn't see them. Later, when Jubal finally reached the Rockies he saw such an animal.