a much easier test
Until someone EXAMINES the formation and takes plant and soil samples, they have to go in the "unknown" bucket. When there are NO tracks going into a pristine formation, no pole holes, no broken wheat....when the stems are bent over at "nodes", when the seed heads are twisted, when meteoritic filings are found, THEN we have the possibility of a genuine circle.
Actually a simpler method to determine if its a genuine circle is to see if the circumferance = 2 (pi) r
If it does, then VOILA a genuine circle, if not its probably more like an ellipse or some other circle like shape.
Steve G. (this ought to save tons of money in research by our CIA)