157 



and Hunter's Mill, Perth, these systems crop up in limited 

 patches. 



That the rocks of both Mesozoic and Upper Palaeozoic 

 age are most intimately associated with the overlying Ter- 

 tiaries is apparent from the great abundance of watern-worn 

 pebbles of silicified coniferous woods similar to those of the 

 Jerusalem Basin, and also from the abundance of water- worn 

 fragments of the Fenesiella mudstones which testify of the 

 close neighbourhood of the parent rock from which they were 

 derived. 



The great undulating plains, nowhere ranging much above 

 or below from 500 to 800 feet above sea level, are bounded by 

 the northern face of the Western Tiers as by a mountain 

 wall, and suggest the shore line of an ancient plane of 

 marine denudation. The fringe of marine beds of Upper 

 Pateozoic age, everywhere found along the base of the 

 Central Plateau, also support this idea, although it must be 

 confessed that the evidence of lines of fault running almost, 

 parallel with the direction of the margin of the elevated 

 plateau, and throwing the latter up to a great height, greatly 

 complicates the solution of this question. 



The coal seams, composed partly of dull and partly of 

 lustrous bands, occurring at Norwich, are of somewhat 

 similar character to certain seams in the Fingal Basin, and 

 however related in point of sequence, it is clear from the 

 abundance of the typical plants, Zengophyllites elongatus, 

 (Morris), Alethopteris Australia (Morris), Thinnfeldia obtusi- 

 folia (Johnston), etc., that they belong to the same great 

 Mesozoic system. There are also forms occurring in the 

 greyish white shales at Norwich, which, as yet, have not been 

 disclosed in the members of otherwise closely related basins 

 of the same system. 



The following is a more complete list of the plant forms 

 identified by me in the shales associated with the coal seams 

 at Norwich : — 



Filicbs. 



Sphenopteris lobifolia. Morris. 

 Thinnfeldia oblusifolia. R. M. Johnston. 



„ „ media. Ten. Woods. 

 Pecopteris caudata. R. M. Johnston. 

 Alethopteris Australis. Morris. 

 Dansea (Tseniopteris) Morrisiana. R. M. Johnston. 



Equisetaceat. 



Phyllotheca Australis. Brongt. 

 „ „ Hookeri. M'Coy. 



Annularia. Sp. indet. (sSeed). 

 Coniferai 1 



Zeugophyllites elongatus. Morris. (Very abundant.^ 

 Mr. Blanch Brain has also provided mo with additional 



