Gday Wooly.
Agate creek is a
long way from Tannum Sands, otherwise I would be there every other weekend (I'm at Benaraby)
Agate creek is in the Gulf country, in the Forsyth area, a long way to the west of Cairns. A pretty isolated spot but still well worth it judging by the amazing agate that comes from there.
Riverslea crossing has plenty of petrified wood but I've never found any amber. It sounds like you have a piece of orange chalcedony, I've picked up plenty of that at Riverslea over the years, as well as drums of petrified wood. It looks fantastic but only one piece in hundreds seems to have the orange colour running right through, most pieces just have a 1 mm or so thick orange skin that disappears as you start to cab it, turning a drab milky translucent
There's still some interesting stuff there though.
I haven't actually been to Mount Hay since I was a kid, the thundereggs I have yet to open were found there by my grandfather and lived in a dusty corner of his shed for decades.
If you're at Tannum or Gladstone or Calliope and you want some petrified wood from Riverslea just let me know, I've got heaps (then again, you probably have too if you've been to Riverslea). I don't have a big enough saw to handle the larger chunks.
Cheers