I'd love to look at the "soil types" map, but the text is too small, and if enlarged loses resolution. However I researched it a little and I'm definitely in the "Mississippian" and/or 'Ordovician" areas....meaning sedimentary: limestone, shale, chert, sandstone, dolomite, etc.

You characterize my goals for the pond perfectly: that is exactly what I want. I know I'll have to learn to manage the nutrient levels and all it entails.