We visited this formation around 1130 am today, 3 Aug 10.  The map coords are:  415854,161212  I’ve enclosed a ground sketch from my walk around.  The shaded areas are the flattened wheat.  The large ring is about 4’ wide with a diameter of about 140’.  The laid circle on top is about 40’ in diameter.  The width of the two arcing paths going through the centre of the large ring were about 10 or 12’ across.  There was a small five pointed asterisk type marking at the base.  The nest in the centre of the laid circle was pretty much directly in the middle of the geometric centre.  Of note, the nominal centre of the circumscribing ring was in the centre of standing wheat with no broken wheat in the vicinity.