BY THE REV. J. MILNE CURRAN, F.G.S. 179 



37. Lin. Soc, N.S.W., Vol. VIIL, p. 112. 



38. Lin. Soc, N.S.W., Vol. VIIL, p. 113. 



39. Lin. Soc, N.S.W., Vol. VIIL, p. 114. 



40. Lin. Soc, N.S.W., Vol. VIIL, p. 118. 



41. Tenison-Woods. Lin. Soc, N.S.W., Vol. VIIL, p. 106. 

 Royal Soc, N.S.W., 1883, p, 82. 



43. Lin. Soc, N.S.W., Vol. VIIL, p. 94. 



44. Lin. Soc, N.S.W., Vol. VIIL, p. 163, 



45. 46. Lin. Soc, N.S.W., Vol. VIIL, p. 54, 



47. Lin. Soc, N.S.W., Vol. VIIL, p. 105, and Cavruther's 

 Qutly. Jour. Geol. Soc, Vol. XXVIIL, p. 355. 



48. Mines and Mineral Stat., 1875, p. 178. (In later editions 

 Mr. Clarke substitutes name Voltzia.) 



Age of Formations. — Although lithological resemblances are not 

 always a safe guide in identifying widely separated formations, 

 3'^et, before any fossils were found, the general opinion was that 

 the Hawkesbury and Dubbo sandstones were of the same age. 

 Fossils have since been discovered which confirm that opinion. 

 The age of the Ballimore coal beds is not so easily determined. 

 As may be seen from table A, Dubbo and Ballimore have not one 

 fossil plant common to the two places. A comparison with New- 

 castle or Bowenfels is out of the question. No trace of Glossopteris 

 is known from Ballimore. But the general aspect of the Balli- 

 more fossils would lead me to think that Ballimore is a connecting 

 link between the Upper Coal and the Hawkesbury rocks, that is, 

 if the Clarence River beds are really newer than Hawkesbury 

 sandstone. 



The following fossils are recorded from the Clarence : — Alethop- 

 teris australis, Thinnfeldia odontopteroides, Spheno2')teris, sjo. 

 Tceniopteris Daintreei, Zeugophyllites, Walchia. If we except 

 Taeniopteris they differ in no way "from the Hawkesbury fossils. 

 It is not easy to see why the former are considered as of Jurassic 

 and the latter of Triassic age. The table appended (B) shows how 

 the formations referred to in this paper ai'e correlated by living 



