Sanders Preserve in Glenville NY Flickr Photos

Looking around, I found a couple flickr photos of rock piles or stone mounds at Sanders Preserve in Glenville NY, prompted by PWAX post:

http://rockpiles.blogspot.com/2013/10/rock-piles-at-sanders-preserve-in.html

http://www.flickr.com/photos/dougtone/6441159323/

http://www.flickr.com/photos/dougtone/6441150809/sizes/o/in/photostream/

Possibly a Stone Worked Spring? 

http://www.flickr.com/photos/dougtone/6441179307/

The whole set:

http://www.flickr.com/photos/dougtone/sets/72157628245655557/with/6441159889/