I live right on the shore of the Long Island sound. The last glacier literally stopped in my backyard. Everything is rocks and gravel. 2 miles south it is mostly sand and dirt. Anyway, there is a plague in Northport LI (founded 1642) that commemorates the Indians that used to live here https://www.flickr.com/photos/theheylady/4569572149/ [1] Who were these people and did they really leave? I presume Indians lived here right up until the Europeans moved in.
That is truly strange. I don't have my books on the archaeology of New York with me, but I'm pretty sure the Shinnecock would have occupied your part of Long Island until (and possibly even after) European contact and the establishment of your town. The Shinnecock still live on Long Island, their reservation is way out east. There is a Shinnecock museum that I keep meaning to go to, but it's so far out there!
My theory is that the sign marks an archaeological site that was excavated and all of the materials were analyzed. The materials from that site probably date to the period listed on the sign. I bet if you got in touch with your historical society they would know.
Hmm. I'd check with the Huntington historical society. Don't they place those signs?
Shouldn't the people stop calling Indigenous people as Indians, It so confusing for us Indians, I was wondering What Indians connection is with Long Island.