It's close to there, it's Sippewisset (sp.) Don't remember Black Beach exactly but sure I've been there. Old Silver has a tidal marsh, as a kid used to love sitting in a tube letting the tide take me in or out.
Yeah, I spent literally hundreds or thousands of days at Chappa and Old Silver. My favorite was always Woodneck, few if any crowds and has that cool little inlet. But any of the Buzzards Bay side beaches are pretty good