Ive got a fair bit of the stuff mate, big and small
I used to go out hunting and collecting where ever i could
ONE DAY ... i will post some pics (its all in a storage shed)
My favourite piece (and my mums

) is bigger than a football , the actual size isnt the kicker, i jigsawed it back together with supaglue after digging it all out , the biggest piece is about 3
I do know where there are a couple of huge CHUNKS about 3 x2 :8 but no way of getting them out
I could probably find a link to info on a local petrified forrest if your interested (my info was from the library ... its a building that contains lots of books

layful:
I used to take my kids to the foreshore and walk across the branches of a giant tree in the rock plateau when conditions allowed