291 
Mountains, near Braidwood. The Stroud Series of New South Wales, with 
its associated volcanic rocks, may he homotoxial with the Lower Bowen 
Division in part, and in part with the Star Borniation. An attempt has been 
made by me, elsewhere, to summarise present ideas as to the relations to one 
another of some of these divisions in New South Wales/ 
It is clear that, as shown above,'^ there is an immense unconformity 
between the Coal-measures (Upper or Middle Bowen) of Fraser’s Creek Station, 
near Ashford, New South Wales, and the Gympie rocks in the same neigh- 
bourhood. This unconformity has been figured and described in more detail 
by Mr. E. F. Pittman, Assoc. B.S.M., the Government Geologist of New 
South Wales. ^ 
These sections make it clear that, inasmuch as the l)edding planes of 
the Middle or Upper Bowen Coal-measures are at right angles to those of the 
Gympie there is a vast unconformity at that locality between these two for- 
mations. As it is probable that some of the localities, from which the fossils 
described in this work by De Koninck were derived, are situated in the Gympie 
Formation, it obviously is now of importance to separate the Gympie localities, 
if possible, from the Middle and Upper Bowen. Sufficient evidence, however, 
has not as yet been obtained in New South Wales to j^rove whether certain 
of these localities belong to the Gympie or to the Star Formations. 
Hitherto no marked unconformity has been observed between the 
Star (?) formation on the one hand and the Middle or Upper Bowen Forma- 
tion, in New South Wales, on the other. 
While the extreme divisions of the so-called Permo-Carboniferous 
System {i.e., the Gympie and the Upper or Middle Bowen Formations) are 
strongly unconformable to one another, unconformity has not yet been 
observed between its middle members. Mr. E. Etheridge, Junr.,^ has shown 
that there is nevertheless sufficient palteontological evidence to justify the 
separation of these formations in New South Wales into two distinct groups. 
The older group is characterised by such forms in its marine fauna as 
J?roductus semireticulatus, Martin, occasional Trilobites, such as those herein 
described by De Koninck as Fliillipsia seminifera, J. Phillips, Griffithides 
1 Procs. Linn. Soc. N. S. Wales, 1893, VIII (2), pp. 584-594, PL xxviii. 
^ Op. cit., p. 587, pi. 28. 
® Records Geol. Survey N. S. Wales, 1896, V, Pt. 1, pp. 26-30, Pis. 3, 4. 
‘ Mem. Geol. Survey N. S. Wales, Pal. V, Pt. 1, 1891, pp. 3, 4. 
2q 
