30 PEOF. T. W. E. DAVID & ME. E. Y. PITTMAN [Eeb. 1 899, 



The general conclusion formed at present is that in Eastern 

 Australia Lejjidodendron australe, being closely associated with 

 BliynclioneUa pJeurodon, and almost immediately and quite conform- 

 ably overlying quartzites containing an abundance of Spirifer 

 disjunchis, descends in some cases into Devonian rocks. Its occur- 

 rence in the Gympie rocks of Queensland, in association with a 

 marine fauna of Carboniferous affinities, proves that it also ascends 

 into strata of that age.^ 



The occurrence near Tamworth of L. australe in a series con- 

 formably overlying a coral-limestone containing a typical Burdekin 

 (Middle Devonian of Queensland) fauna is strongly in favour of 

 its age being referable to some part of Devonian time, perhaps 

 Upper Devonian. The evidence of the marine fossils, other than 

 radiolaria, also suggests that the radiolarian rocks of this neighbour- 

 hood were formed in Devonian time. If this provisional conclusion 

 be correct, it is doubtful whether the Tamworth radiolarian beds 

 can be considered homotnsial with those at the Jenolan Caves, 

 about 200 miles south by west from Tamworth, already mentioned 

 (pp. 17, 18). 



(iii) At the Jenolan Caves, radiolaria occur in the form of chalce- 

 donic casts, chiefly in the black cherts and black clay-shales over- 

 lying the coral cave-limestone. They may also be seen, though very 

 obscurely, in great numbers in the greenish-grey shales which 

 underlie the limestone. 



Mr. E. Etheridge, jun.,^ has recorded the following fossils as 

 occurring in the Jenolan Cave limestone : — Pentamerus Knightii, 

 J. Sow. ; PaJceoniso Brazieri, Eth. fil. ; Looconema antiqua, De Kon. ; 

 a large Favosites ; and Tryplasma wellingtonense.^ Stromatoporella 

 is also abundant. 



Mr. Etheridge considers that the large varieties of Pentamerus 

 Kniglitii are suggestive of a geological age approximating to that of 

 the Aymestry Limestone of England. At the same time, he points 

 out that this fossil has not yet been identified in any rocks in New 

 South Wales as old as Upper Silurian. The fact should also be 

 mentioned that no typical Upper Silurian corals and no trilobites, so 

 characteristic of the Upper Silurian of New South Wales, have as 

 yet been found at Jenolan. No good ground, therefore, exists at 



M'Coy: its Synonyms & Range in E. Australia,' by R. Etheridge, jun. ; Rep. 

 Austr. Assoc. Adv. Sci. vol. iv (1892) pp. 332-337 — ' Occurrence of Lepido- 

 dendron near Bathurst,' by W. J. Olunies Ross ; Proc. Linn. Soc. N.S.W. 

 ser. 2, vol. viii (1893) pp. 121-125; Rec. Geol. Surv. N.S.W. vol. iii (1893) 

 pp. 194-201 & p]s. xvii-xix — ' Occurrence of Lepidodendron australe (?) in the 

 Devonian Rocks of N.S.W.,' by T. W. E. David & E. F. Pittman ; Rep. 

 Austr. Assoc. Adv. Sci. Adelaide, vol. v (1893) pp. 397-404 & pi. xv— 

 ' Oontrib. to Study of Vole. Action in E. Australia,' by T. W. E. David. 



1 ' Geol. & Palaont. of Queensland & New Guinea ' (1892) pp. 179, 196, etc. 

 R. L. Jack & R. Etheridge, jun. 



2 Rec. Geol. Surv. N.S.W. vol. iii (1892) p. 57, and Ann. Rep. Dep. Mines, 

 N.S.W. 1892 [1893] p. 128. 



3 Rec. Geol. Surv. N.S.W. vol. iv (1895) pp. 160-162 & pi. xxi, fig. 5. 



