Formed rock pile at the Longswamp site
Yesterday I visited the new Sigal Museum in Easton, Pennsylvania, at the suggestion of Fred Werkheiser. I was pleased to find an excellent full-room exhibit on the Lenape that included a photo of the above structure from what we've been calling the Oley Hills Site. On the sign about "sacred sites" they call it the Longswamp site, which locates it more accurately.
In the ten years since I was introduced to the rock piles and their mystique, things have certainly come a long way! There was even a CD, containing a power point presentation on the sites, for sale in the museum gift shop. I couldn't get it just then, but I hope to soon.
In connection with something else, I've been going through old papers from 2001, and I came across an email (That was back when I used to print out emails I wanted to keep. Wise, as it turns out.) I was copied in on, in which it is suggested that people interested in this topic should browse the reports of the Bureau of Ethnology to the Secretary of the Smithsonian. In particular the 1890-1891 issue is said to be relevant.
These are now online, as perhaps some of you may know. For those who don't, it's something to peruse should we get another storm or something else that allows you time for fiddling. The email recommends pages 690 to 701, but I imagine there's more to be found. Anyway, here's a link to the introduction of that year. You can use the table of contents to move around. Just click on the page number. Enjoy!
P.S.: I couldn't access the link that Norman Muller gives in the comments, but he has excellent articles on the Oley Hills/Longswamp site here and here.