BY A. B. WALKOM. 93 



gara bore, "fossils" are indicated in shale at 535 feet, and 

 " plant- remains" at about 1,300 feet. 



Although the information is scanty, it niay be concluded that 

 comparatively flat-bedded rocks of Jurassic Age, and of con- 

 siderable thickness, cover a large area in Western Australia; 

 that these beds contain both marine and plant-fossils, and that 

 the plant-fossils include equisetaceous stems, Otozamitps and 

 coniferous fragments, and also petrified, coniferous wood. 



Where definite evidence for accurate correlation is scant}', as 

 in the present case, all possible indications must be considered: 

 and, at the same time, caution must be exercised in drawing 

 conclusions. In comparing these Western Australian Jurassic 

 rocks with the Lower Mesozoic strata of Queensland, the follow- 

 ing points stand out .— {a) In the Western Australian Jurassic, 

 the only definitely determined plant is Otozamites Feistmcmte/i, 

 which occurs in a fine-grained, ferruginous sandstone, possibly 

 of Oolite age; {h) in Queensland, fossil plants are abundant in 

 the Lower Mesozoic strata, but the genus Otozamites occurs only 

 in the Walloon Series, and usually in a fine-grained, ferruginous 

 sandst<jne, which is of very wide occurrence;* (c) the species 

 Otozamites Feistmanteli occurs both in the Western Australian 

 Jurassic and in the Queensland Walloon Series. 



The indications, then, point to the probability that the AA'all- 

 oon Series is homotaxial with the Jurassic strata of Western 

 Australia. If, as the author believes, the development of the 

 fine-grained, ferruginous sandstone containing Otozamites Feist- 

 manteli indicates peculiar conditions under which deposition 

 took place, then there is the further indication that the two 

 Series are synchronous. 



(e) 'Tasmania. — A rich. Lower Mesozoic flora is present in the 

 strata of that age in Tasmania. This flora, however, has been 

 untouched for many years, and the existing descriptions and 

 figures by Johnston are too imperfect to be used for any purpose 

 of definite correlation. In addition, Mr. Twelvetrees, Govern- 

 ment Geologist of Tasmania, kindly informed me that the rela- 



* See above, p..')*). 



