Seen and photographed today under heavy tea tree cover on a westerly slope Estate Spur Fraser Park.
Quite a bit of light in the area but probably little if any at all direct sunlight would hit them.
From a distance I thought it was large bones of some sort but as can be seen, not so.
The "What is it_1" was about 20cm across, quite unusual and strangely attractive to my eyes (in an arte farte sort of way that is).
There was 2 others slightly smaller maybe 12cm across and that was all that we saw of them all day.