Interesting.Don't know if you've ever been to Central Park but I visit NYC pretty regularly (for fun...I'm retired) and always pay at least a quick visit there and often spend hours.I've always wondered what those rocky outcrops were that are seen scattered around the park as well as the huge rocks found there.It was only fairly recently that I stumbled upon some science documentary that told the story of the park and the glacier.
Spent a couple of years in Brentwood and East Islip “during the Eisenhower administration”, but don’t recall ever getting to Central Park.