Bright, multiple-color changing, silent craft landed in field

Duncan Downs owner and wife notice multi-colored lights on what both wondered might, perhaps be a helicopter that seemed to have landed in a their pasture, just north of the racetrack. The couple got in the owners pick-up and drove closer to the sight. The couple stopped to observe the lights with their vehicle windows down before entering the pasture. The couple noticed there was absolutely no sound coming from the area. Not able to identify a logical explanation for the event the couple decided to ignore the situation and make their way back to their house when at about the same time the lights darted upward into the sky then quickly disappeared. The next day the couple along with family, friends, & an employee explored the area to find a perfectly oval shaped dirt area seemingly cookie cutter like, distinctively etched out from the surrounding near knee high native and wheat grass pasture.