Megaliths in Montana, USA
Belle Chase writes:
"13 Moons and 28 days on all turtle shells. This equals 364 days, plus one day of rest. All indigenous people around the world knew the wisdom of the turtle and followed a 13 month calendar; after all, there are 13 moon cycles in a year and 27 to 29 days per cycle.
It's almost as if man subtracted one month in order to sever the connection between the people and the sun, moon, and stars which are themselves a giant clock."