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These are moon rocks. Found on the Dinosaur Trail QLD.
If you look at the first rock you can see a fossilised Ammonite shell and also some small mussel type shells.
They grow from a "seed" possibly a fossil or bit of sand. The end result is like concrete. Well preserved fossils can be found in the centres of some.
The moon rocks here are large boulders. They grow into all different sizes.

#Richmond #Australia #Ammonite #Queensland #OutBack #Fossils #Geology #Palaeontology #Rock