Documents that have become available under the
30-year rule at the National Archives of Australia reveal:

. . . . . details of an ''unidentified physical feature'' of circles on Milo Station at Adavale, Queensland, in 1982. The file refers to photographs that apparently were taken, but they were not among the papers.

Constable Geoffrey Russell, from the local police station, visited the site and wrote a report for RAAF Base Amberley near Ipswich. The officer saw depressions in the ground and thought they were caused by a motorcyclist doing donuts but then dismissed the idea.

He wrote: ''I strongly feel this [is] no hoax even though I do not know the cause of this 'feature'.''

He described a large circle of 2330mm in diameter with one inner circle of 2010mm which were 160mm in width and about 15-20 mm deep. The soil around the outer circle appeared to have been ''blown away'', he said.

SOURCE: http://www.smh.com.au/technology/sci-tech/secret-ufo-files-released-20120804-23mhq.html#ixzz2DpkvuxbF

MILO??

. . . . includes detailed reports on "the phenotype of unidentified objects" discovered in Milo Station in Queensland in 1982. This document refers to the photos were taken earlier, but the picture was not among the newly published documents.

Geoffrey Russell officers, working at a local police station, wrote a report to the RAAF base Amberley to describe a large circle, the circle’s diameter smaller than 2330m with the 160mm width and the depth in 15 – 30mm. Land around the outer circle seems to have been "blown away" rather than being dug.