Hello Adrian,


Search via Australian Museum or via "Age of Fishes Museum" in Google and you should get information on all this.

The particular fossiliferous lens discovered in 1956 near Canowindra was probably just about all entirely dug up in due course and the slabs removed to the museum's land.  It was in all some 180 slabs of  80 t mass, which ought to hold/yield 3000-4000 fish specimens.
 
The museum may have facilities for visitors to do things?   Wellington Caves precincts, for example, is a site which has for some years now had some palae-lab facilities where (for a fee) people can work with fossils in various ways.

Although Devonian full fish are very rare, individual scattered plates from their armour can more often (but still  uncommonly) be found in the Devonian hard sandstones or 'quartzites' which are very widespread in central NSW.  There's a man named Alex Ritchie who knows where all the old fish hang out.   Others may know too.

I've found a few myself but you usually find then when you are NOT looking for them.   If you actually look for them you might never find them :-)

Regards,



John Byrnes