I'm joining in Lisa Talbott Lisson's challenge to help identify the people in this photo.
You can read my first post here, explaining the little bit I know about the provenance of the photo.
The second step that Lisa suggests is to identify the type of photograph. She lists 5 options. Since this photograph is a digital image downloaded from www.ancestry.com, all I can do is offer a "best guess"!
I do have some other photographs - not of the same people - with that similar sepia/cream colouring. The extreme right edge of the photograph can just be seen, and it looks like it is attached to thick cream card. So I'm opting for a cabinet card. Lisa advises that these were popular in the 1860's-1890's ... I wonder if that was also the case here in Australia? Some further research is in order, I think :-)