19 
The types of Thinnfeldia occurring in the Southern Hemisphere are 
specifically distinct from those of the Northern Hemisphere. Gothan, indeed, 
proposed a new generic name ( Dicroidium ) for them, but on insufficient 
grounds . 1 The Northern Hemisphere Thinnfeldias occur in ( botli Triassic 
and Jurassic strata. 
Tceniopteris spatulata is the most characteristic plant of the Australian 
Jurassic, having nowhere been found in Australia in rocks older than those 
now classed as Jurassic (Walloon Series, and its equivalents of Queensland, 
Clarence and Artesian Series of New South Wales, etc.). In India it occurs 
in the Rajmahal Series of Bengal and other parts. It has been recorded from 
somewhat older rocks (Rhsetic), in Tonkin and New Zealand, but we do not 
yet know the relative ages of these strata and the Australian Triassic and 
Jurassic. A study of the flora of the Ipswich Series in Queensland has 
indicated that that Series is probably somewhat older than Rhsetic . 2 The 
so-called Jurassic rocks in Australia represent a considerable thickness of 
strata, aird whether some of their lower portion corresponds to what many 
European authors term Rhsetic, it is impossible to say at present. 
The statement, however, still holds good, that T. spatulata. is not known 
in the Triassic of Australia. 
Podozamites lanceolatus is another extremely common Mesozoic plant, 
ranging from Rhsetic to Cretaceous. In spite of its abundance it has not yet 
been found definitely associated with cones, but the probability is that it 
belongs to the Conifers. 
Seed-bearing scales of Araucarian cones are of widespread occurrence 
in Jurassic and also in Cretaceous rocks. In Australia they occur also in the 
Clarence Series of New South Wales (Jurassic), in the Jurassic of Victoria, and 
in the Burrum Series (L. Cretaceous) in Queensland. 
Elatocladus plana occurs in the Jurassic of India, as well as in rocks of 
similar age in Queensland. Closely allied types occur in Jurassic rocks in 
Victoria and New Zealand. 
Pagiophyllum peregrinum is a Jurassic type of very common occurrence 
in the European Jurassic (Lias), and is also found in rocks classed by Arber as 
Middle Jurassic in New Zealand. In Australia it ascends into the Lower 
Cretaceous, being a fairly common constituent of the flora of the Burrum 
Series in Queensland. 
From this short summary of the ranges of the species comprising the 
flora of the Talbragar Beds, it will be seen that in determining its age we must 
be guided by the facies of the flora as a whole, rather than 'by individual species. 
1 See Q’land Geol. Surv., Pub. 257, p. 13. 
2 Pron. Linn. Soc. N.S.W., xliii, 1918, p. 71. 
f 1239— D 
