8 QUEENSLAND FOSSIL FLORAS 
the possibility of a correlation with the beds in New 
South Wales in which Rhacopteris is very abundant, and 
which are usually classed as Upper Carboniferous. 
The number of definitely-determined species is very 
small and the preservation is, in general, so poor that 
we know very little of the structure of the Queensland 
specimens; it is, therefore, not possible in the present 
state of our knowledge, to make any detailed comparison 
with Carboniferous floras outside Australia. It is not even 
possible to make reasonable comparisons between the 
different Series in Queensland in which these plants are 
present. They may all represent approximately the one 
horizon within the Carboniferous, but it must be borne in 
mind that they may represent distinct horizons, and there 
is the possibility that one or more of the Series mentioned 
may be older than Carboniferous. 
As matters stand at present we have to'rely. on the 
general Carboniferous facies of the flora and the fact that 
in some cases the plants are associated with marine fossils 
which also indicate a Carboniferous age. 
aX . —* Sa ine 
Fic. 1—Map showing approximately the distribution of floras of Upper 
Carboniferous Age. (Mainly after David White). 
