For some reason, when I first wake up in the morning is when my mind tends to have insightful -- but mostly crazy -- thoughts. So, let the debunking... erhm... discussion begin!
What if the Mima Mounds in western Washington are the site of some ancient hugelkultur beds? Perhaps their fertility has long since run through, so they maintain their structure but can currently only support prairie. Or perhaps they were designed that way. There is a lot of gravel in the mounds, so perhaps the first peoples in the region were attempting to grow prairie plants that were more suited to a warmer climate?
I'm probably crazy and way off base, but for some reason one of the first thoughts in my head this morning was "maybe the Mima Mounds are really ancient hugelkultur beds."
For some info, read about the Mima Mounds at
http://en.wikipedia.org/wiki/Mima_mounds
And here's a picture!
