Boulders in Smithfield RI

This photo above comes from here:
https://trailsandwalksri.wordpress.com/category/mercer-lookout/
(By some power lines, if you look here: http://www.exploreri.org/trailmaps/wolf_hill_map.pdf
or here: http://binged.it/1Qv7fN2)

Also at Wolf Hill Forest Preserve - Smithfield, RI, I find someone relates that "Stone walls (are) everywhere..."

http://www.yelp.com/biz/wolf-hill-forest-preserve-smithfield

This, "Quartz rock at Nipsachuck, showing repeated use in artifact making," comes from: 

http://www.bvhsri.org/past-events/2014-annual-meeting-and-christine-nowak-lecture-with-kevin-mcbride/