BY A. B. WALKOM. 91 



Recent developments in Queensland sliow that large areas of 

 sandstone on the margin of the Artesian Basin, which have pre- 

 viously been regarded as of Cretaceous Age, must now be con- 

 sidered as equivalents of the Walloon Series. Future work may 

 show that the marginal portions of the Artesian Basin in South 

 Australia represent the same sandstones, though these are all at 

 present mapped as Cretaceous. Near the margins of the basin, 

 the water-bearing sandstones obviously approach close to the 

 surface, as shown from bore-records, and it seems more probable 

 that they outcrop, than that they are overlapped by the Cre- 

 taceous. 



The fossil plants recoi'ded from the South Australian Lower 

 Mesozoic rocks are : — 

 Thiiwfeldia odontopteroides Alefhopteins sp. 



[?=7'. Feistmaiiteil]. Equisetum 2 spp. 



T media [? T. lancifolia\. Frenelopsif>{l). 



MacroUt^niopteris iciaiiamatfxe. AtifJirophyopaisd) sp.ind. 

 TiHiiiopteris jiuctuans. 



Fhyllojderis Feistmanteli occurs at Ooroowilanie Swamp, about 

 100 miles north of Leigh's Creek, but this may be in tlie Creta- 

 ceous rocks. This list has been drawn up by Howchin,* maiiily 

 from determinations by Etheridge. Unio eyretisis also occurs 

 abundantly in the same rocks. 



This list of plants does not provide any very conclusive evi- 

 dence regarding correlation with other Australian strata. There 

 seems no reason for not considering the Leigh's Creek basin as 

 an outlier of the Artesian Series: and, further, the identity of 

 the Artesian Series with that of New South Wales and the 

 Walloon Series in Queensland is hardly open to question. 



{d) Western A us ti-alia. ^V^ estevn Australia provides the only 

 Australian example of marine and freshwater fossils of Lower 

 Mesozoic Age occurring in association with one another. The 

 exact relation which the plant-beanng beds bear to those with 

 marine fossils is not clearly stated, but it may be inferred from 

 a study of Bulletins 36, 3y, and 50 of the Geological Sur^ ey of 

 Western Australia. 



* British Assuc. Adv. of .Science : Handbook of South Australia, 1914, p.22o. 



