We must assume that the early history of the Northwest is under water.  The stones below are from North America’s Great Lakes.  A digression: interest in homo sapiens focuses on when the lady with the mitochondrial DNA appeared, science calls her “African Eve.”  No humans alive today does not have it: New York to Nome to Niger.  The focus might instead be on the several times our species almost went extinct … pressure times when homo sapiens dropped to 2,000 or so individuals … a best guess the last time was 25,000 years ago.  2,000 to 8 billion in 25,000 years, a truly remarkable growth rate.  This writer’s hope is that whether 1,000 years from now it is 8 million, 8 billion, or 80 billion populaces, we’d learn to live on this Earth … caring for it, concerned with its well-being.  It is not the number of people alive that is the concern, it is that those alive today, our generation, are careless.

https://www.history.com/news/prehistoric-ancestors-population-decline
https://www.cnbc.com/2023/09/20/un-chief-calls-for-an-end-to-7-trillion-in-fossil-fuel-subsidies.html 
https://www.sciencedirect.com/science/article/abs/pii/S0277379108002060
https://www.tdisdi.com/sdi-diver-news/sunken-cities-around-the-world/
https://explorersweb.com/the-real-atlantises-seven-sunken-cities-from-around-the-world/

Ancient cities can be underwater because of:

global warming
dams, tsunamis, volcanos
all the above

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