New Jersey and Stonehenge

At work, a colleague told me that there is a stonehenge in New Jersey called Tripod rock located atop Pyramid mountain in Kinnelon (Morris County), NJ. He was b-s' ing me, I thought. For the rest of the day, it preoccupied me. When I came home at the end of the day, I thought of a book my son gave me for my birthday a couple of years ago called 'Weird N.J.' It was almost instinct. I only read a few pages of the book. I looked on the index for stonehenge. No entry. Kinnelon, page 30. I turned to the page and there was a picture. I googled it http://www.njskylands.com/odhiketripod.htm. There is a picture. Some weird stuff in NJ.

I thought of stonehenge synonymous to England. I guest not.