Clicking links to a survey done by Henry Thoreau for Emerson, with six of the corners noted as having a "stake & stones." This practice is still occasionally used today.
It is likely most Eastern cairns were created by Native societies which preceded the Algonquians in this region.
The stone cairns associated with the Mississippian cultural region can generally be assumed to date from that era Cairns range in style from a few stones placed on top of a boulder, to enormous constructions containing hundreds of thousands of tons of stone.
A pile of stones heaped up as a landmark." Stone piles, heaps or mounds are alternate names for cairns.
Cairns have served to memorialize people, locations or events.
My present opinion is that its circumference is about 25 feet.