btw in my travels i saw a Dr Karl page that said
'The most famous one is Wolf Creek Crater (WA, 19º10'S, 127º48'E),
about 130 kilometres south of Halls Creek. It's the second most
perfect crater known on the planet. The American astronauts came to
train in it and to get a feel of what the moon craters would be like. It's
a very grand crater, about 900 metres across, with a well-formed rim
towering 25 metres over the surrounding countryside. The original
crater floor is about 150 metres below the rim, but has been partly
filled in by wind-blown dirt'
http://www.abc.net.au/labnotes/read/...rs/default.htm
that was news to me! ??