170 l.'KOCKEDINGS OF THE KOYAL SOCIETY OF QUEENSLAND. 



all the fossiliferous horizons detected throughout the 

 district were collected from and no species of TJiinnfeldia 

 were found. Tenison-Woods, however, asserts that the 

 sjjeoies described by him is by far the racst abundant form 

 in that locality, but that position I find undoubtedly belongs 

 to Cladoplilehis australis, which is present in practically 

 every specimen collected. T. spatulaia and Sphenopteris 

 sp. are also prominent. 



From all this evidence emerges the following ccnclu- 

 sions:— (1) That ThinnfekUa, the predominant genus of 

 the Ipswich Beds, appears to be practically, if not 

 absolutely, absent from the Walloon in the districts men- 

 tioned; (2) that the large-leaved Taniopteridie, as well as 

 T. Tenison-Woodsi ond T. Dunstani, similarly do not ascend 

 into the Walloon, as far as we know, this genus being only 

 represented (though in great abundance) so far by T. 

 ■spatulata; and (3) the overwhehning predominance of 

 Cladoplilehis australis in the Walloon. 



In view of the field work done, involving the examina- 

 tion of many hundreds of specimens from widely separated 

 horizons, I think these conclusions can be stated with con- 

 fidence; and it is to be noted that the evidence from the 

 three areas of Moreton, Darling Downs, and Roma districts 

 is wholly in agreement on these points, and indicates a 

 strong pala?ontological break between the Ipswich Series 

 and the Esk Series on the one hand, and the Walloon on 

 the other. There are other differences, of course, to which 

 Dr. Walkom has drawn attention, notably those relating to 

 the Gingkoales, Conifers, and Cycads. While Thinnfeldia 

 has not been found associated with Trpniopteris spatulata 

 in the Walloon in these areas, it is, of course, known that 

 they have been recorded together in the Clarence Series 

 and are frequently associated in the Talbragar Beds of New 

 South Wales. 



It is also of interest that Thinnfeldia lias not so far 

 been recorded from the LoAver Cretaceous of i\Iaryborough 

 or the Styx Coalfield, and that the one record of the genus 

 from the Burrum Lower Cretaceous Series is to be regarded 

 as a doubtful deterndnation.® Its range in Queensland 

 rocks would thus appear to be possibly much more restricted 

 than was previously thought to be the case. 



* A. B. Walkom. Floras of the Burrum and Styx Eiver Series, 

 Q.G.S.P. 263, p. 15. 



