Nice work! I like collecting useful rocks. I tend to find the best flat ones in the deeper sections of old riverbeds, and the best rounded/ovate speciments higher up toward the banks.
A lot of aussie stone axes were either those long, oval stones or quite rectangular. But the same method of selection, shaping and then grinding usually applied. Noone uses em anymore, who has half a morning to cut down a tree!
Many smaller axes were "vine axes"... supple, flexible canes folded in half, with a stone head in the fold and lashing below it. Made for a reason and then discarded afterwards but some would carry the heads and make handles as needed.
Very tidy work though, thanks for sharing

I have a perfect stone I found a while ago, just have to find some motivation.
Some of the most significant cultural sites here are old axe grinding sites, almost always sandstone ledges or outcrops next to a watersource. Some were used nearly continuosly for ten thousand years or more.
Does that PPG hold up ok to belting through a log or branch? I'd feel bad using any of those pieces to actually cut anything!