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This is a quick video I shot on my GoPro HD Hero2 of the famous Tripod Rock in Kinnelon NJ. The perched boulder is tucked away in Pyramid Mountain Natural Historical Area. This Precambrian gneiss boulder is balanced on three smaller boulders. It is roughly 19' long, 10' wide, and 8' high. Its weight has been estimated as approximately 140 tons. There is a peculiar triangular crest running the length of its top. The point of contact between the main boulder and its support stones form an approximate 3-4-5 triangle. While there is no evidence that Tripod Rock was ever used as a solar observatory, it could function as one if a small portion of the ridge across the valley were kept clear. Tripod Rock is presumed to be a natural, though highly unusual, glacial erratic. It is comparable to the balanced rock in North Salem, New York. Some have suggested that Tripod Rock was modified or adjusted into its present position by lifting and inserting successively larger stones. A local legend suggests it was levitated into position by Native Medicine. While the later explanation is highly unlikely, the Tripod Rock site is located in a region that once had a large Native American population and it is possible that some form of calendar keeping utilized the horizon features of the area.