Devils Marbles (granitic rounded boulders)

Karlu Karlu / Devils Marbles Conservation Reserve is located in Northern Territory

The Devils Marbles are large granitic boulders that form the exposed top layer of an extensive and mostly underground granite formation. The natural processes of weathering and erosionhave created the various shapes of the boulders. Some of the boulders are naturally but precariously balanced atop one another or on larger rock formations, while others have been split cleanly down the middle by natural forces. The boulders are situated in a wide and shallow desert valley, and are found in scattered groups mainly in the western side of the reserve. A short access road leads directly into the boulder fields from the Stuart Highway.^[1]

• http://en.wikipedia.org/wiki/Karlu Karlu / Devils Marbles Conservation Reserve