Beginning in 2008, scientific divers have been conducting an ongoing US Forest Service underwater survey of lakes along the Oregon coast to note the presence or absence of native Oregon Floater mussels (Anodonta oregonensis). Since the melting of the Ice Age glaciers 6,000–14,000 years ago, these freshwater lakes have been alternately joined and separated due to the changing sea levels, sediment influx and dune formation. They are known as depression lakes because they have formed in depressions in the sand dunes.
Friday, August 6, 2010
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