a soil curiosity
For those of you with some knowledge of geology and soil-formation, a scenario:
I've been starting new gardens at my daughter's new location in central MA. There are large outcroppings of granite, surrounded by some relatively flat areas currently lawn. In one direction these slope gently and end up as swamp, or slough, with shallow very slowly-moving water.
Every place I have investigated is about 6-10 inches of jet black slick silty/clayey topsoil, very damp, with very many small pieces of granite in it, and occasionally large pieces. (the grass grows incredibly lush, a shame not to have a cow). Anyway, the real curiosity is that directly underneath this is sand! Just an immediate change, not gradual. Sand with small stones, and the stones look different from the ones in the topsoil. This explains why the grass is not drowned in what should be a saturated location. There is enough sand underneath to give it drainage. I planted an apple tree last fall as a test, it flowered hugely this spring and looks like it's loving it.
There is no possibility that this is an altered site from what I can see. I am wracking my brain trying to imagine how the glacier created this strange yet possibly marvelous situation.