Steve O.
I grew up in Connecticut too (1951-1968) and was back there (Darien) just 10 days ago, at a HS reunion, wandering about as well as partying. Geologically speaking, the good stuff that came from glaciation was called the "terminal moraine" (i.e. the place were glaciation ended and all the big rocks turned into small rocks and sand). Connecticut was 10 to 20 miles north of this, and ended up with loamy soil punctated by lots of middle sized rocks (hence the stone walls and the small pastures). Long Island, Fishers Island, Block Island, Nantucket, Martha's Vineyard and Cape Cod got the good stuff, Hence their poorer agriculture and finer golf courses.
Rich