BY W. X. BENSON. 271 



Stonier reports that basalt overlies Tertiary clays resting on 

 current-bedded sandstones of the Middle Clarence (Warialda) 

 Series with a slight westerly dip. These rest on Carboniferous 

 mudstones dipping E.30°N. at 35" (19). The limestones of the 

 Burindi Series continue northwards, occurring at the head of 

 Slaughterhouse Creek, forming little lenses a foot or eighteen 

 inches thick, composed of crinoid stems. Associated with them 

 are fossil beds containing (20) : 



Spirifera convoluta. Cyathophyllum sp. 



Spirifera sp. Zaphi^entis sp. 



Strophomena sp. Dip)hyphyllum sp. 



Fenestella sp. Syringopora sp. 



These are doubtless related to the Burindi horizon, though 

 the presence of the last two forms is remarkable, and may 

 indicate that they belong to a rather lower horizon. Other 

 limestones occur west of this, as at Tea Tree Creek, which Stutch- 

 bury refers to the same zone as that at Eulowrie. We may 

 compare with this occurrence the presence of Burindi rocks at 

 Rangira, west of the Rocky Creek conglomerates (See p. 267). 



The Carboniferous Series has been traced down to the Gwydir 

 River at Gravesend(36). 



vi. Upper Rocky Creek, and the Nandewar Mountains. 

 West of the gorge of Rocky Creek, that is cut through the 

 conglomerate, the valley opens out into a wide plain, at the back 

 of which rises the Mt. Lindsay group of trachytic peaks, first 

 recognised as such by Sir T. L. Mitchell(2), and Dr. Leichhardt(3). 

 The rocks of the plain are of the Burindi type, with some differ- 

 ences. They dip tg the east, east of the Rocky Creek Station 

 homestead, but, further west, are bent sharply to the west and 

 faulted. A syncline follows, the dip changing to the east. Near 

 the fault, they are interbedded with a peculiar, dense brown, 

 siliceous ironstone-rock, which the writer has traced for over a 

 mile; and there is a small plug of basalt a mile south-west of the 

 station. About a mile north-west of the station (to judge from 

 Stonier's map), Mr. Pittman(23) collected the fossils previoush^ 

 listed (1, Pt. i., pp. 505-507). This indicates a bed on the same 

 horizon as Stutchbury's collecting-ground at Fallal. 



