Marree Man appears to have been formed by a tractor towing a standard farm scarifer.
The grooves were only inches deep and the fact that it has now nearly disappeared after 16 years shows that this type of construction does not have long term effects.
There have been very heavy rainfalls and no measurable erosion.
At one stage the local landowners were interested in getting a a strip graded in close to the Oodnadatta Track and the planehenge sculpture park so they could take tourists to visit the site for a reasonable fee.
Now that would be a great income creating idea so it will probably be stopped by the change resistors.