Originally Posted By: Carcassman
We also need to remember that when the glaciers were retreating there was a pretty good lack of trees. Another aspect is that sea level was maybe 100m lower so the rivers have filled a lot of the valley.


At the same time did the land rise as the weight of the ice was removed as occurred in Iceland? It would be interesting to see an animated portrayal of those geological forces at work over time for, say, the Chehalis valley.
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