My definition of a bog comes from those in northern areas. Our real bogs are deep deposits of peat upon bedrock. The bogs are actually domed in the middle so there is no run-off from neighbouring mineral soils (unlike our fens) so indeed, nutrients come only from rainwater and any materails dissolved in it....except for the occasional passing moose! Bogs in more south-central areas of the USA are VERY different from the bogs of Canada and around northern Michigan. We would consider yours VERY rich in regards to plants and nutrients.
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