280 



PKOCEEDINGS OP THE GEOLOGICAL SOCIETY. [April 24, 



of the Flinders, about six miles above Hugheiiden (Fig. 7) shows how 

 nearly horizontal the great Mesozoic system of the Flinders remains ; 



Fig. 7. — Section of Cretaceous Strata on the Flinders River, 

 si,v miles above HugJienden Sheep Station. 



bat the latter indicates their gentle dip towards the north-east, and 

 therefore places the Hnghenden beds below those of Marathon. 



The observations collected on the journey between these two 

 places give the same result. 



The palteontological evidence is not sufficient to enable Mr. 

 Etheridge to draw any great line of demai'cation. 



His determination of the species from the Hughenden beds is as 

 follows : — 



Ammonites Beudanti, D' Orb., Ya.r. I Avicula hughendensis, £'M. 



Mitehellii, Efh. Pecten &c. 

 Daintreei, Etk. | 



These were obtained from horizontal calcareo- argillaceous beds, 

 fronting the water-hole, where the sheep- wash is placed, about half 

 a mile from the Hughenden Station. 



The Avicida-hed, which is a very marked band, about 4 inches 

 thick, gives by analysis — 



Residue insoluble in HCl, chiefly clay 17-230 



Ammonia-precipitate, of which 1"219 per cent, was ferric oxide 9'3fi8 



Carbonate of lime 67'888 



Carbonate of magnesia 2'520 



Undetermined water, &c 2-994 



100 000 



The Hughenden Cattle-station is twenty miles further up the 

 Flinders than the Hua'henden Head Station. Here hundreds of 



