G'day Kitty,

Bulldust is definitely it: the fine, all-pervasive (usually re-brown) dust of the dry outback. I missed seeing your ellipsis (...), and just rabbitted on about dust - but "bulldust" is the defining signature of the Australian outback!

(There is, of course, the unspoken suggestion that the bull may have added a bit more organic matter than just dust ... and the term is also used as a euphemism for "bullshit - but here it just means fine red dust ... it's far too dry to run cattle at Coober Pedy!)

Regards,

Bob