I think I have seen your round bladed axe as being from the Solomon Islands. I like the stone blade. I think I have info in a book somewhere, will look.
I have a paper, {Stone Axes Factories in the Highlands of East New Guinea. Chappell, J } ; Proceedings of the Prehistoric Society 32 1966.
Some of it is here on this site uploaded many years ago. It helped me identify the origin of one of my axes because of the stone structure from one particular quarry.
Here the stone axes and clubs I have. I did have more but sent them to auction, no deep regrets, I needed to make changes. The first axe on the flour is the fine green stone type with a thin blade only 10mm thick in the centre near the hafting. The one on top is the blade identified in the paper, a heavy blade 28mm thick. The last one seems to be a general purpose axe with a short stubby blade 3cm thick. The clubs I believe are Angu or Kukuku .
Found the link.
http://www.vikingsword.com/vb/showth...t=stone+quarry