This is a site I wrote up some time ago. The place continues to be of interest and I was over there today helping out with a re-survey. More on that later. For now, here is a panorama from in there. This is on Acton's Spring Hill Conservation Land and is a hundred yards up the path from where it begins at the end of Spring Hill Rd. The town's Land Stewards Committee has cleared the place out somewhat and created a side loop off the main trail, so you can walk through the site.
Here is my diagram of the site [Click here]. It was never clear how accurate it is. And hopefully it will now be put to the test.