I remember when i was living in LA, i read some theory about how the mini-mammoths got to the channel islands, and why there is little archaeological sites in s

I remember when i was living in LA, i read some theory about how the mini-mammoths got to the channel islands, and why there is little archaeological sites in southern California. He proposed that at some point in history, people lived in a valley, that is now the waterway between the mainland and the channel islands. He surmised that as the waters rose, they erased the evidence of the man, and stranded a group of mammoths on the island, who slowly shrunk due to limited area and resources. Always thought it was an interesting theory.