Geology of the Lower Mitchell River. 45 



XI. — Saunders' Bluff. 



That this bluff marks the last appearance of the tertiaries on 

 the north bank of the river has already been alluded to. Farther 

 west this bank is entirely occupied by devonian rocks and the 

 river channel from Moitun Creek to Flaggy Creek thus outlines 

 the boundaries of the two formations : the present stream flows 

 now on one side of the flats and then on the other, the gorge 

 itself being from two to three miles wide. 



The river turns south east at Moitun Creek, and then, as we 

 have seen, flows for some miles along the line of junction 

 between unconformable strata. This would probably be the 

 easiest course for the river to take, and its initial deflection to 

 the east at Moitun Creek may have been thus determined. 



Saunders' Bluff is 150 feet high, and up to the top of the iron- 

 stone, or for 110 feet, it stands out as a bold cliff on the river 

 bank. The strata consist of : — - 



Sand 



Fossiliferous ironstone - - - - 



Coloured and banded drift, and pebbles - 

 Ferruginous soft red sandstone to river level 



Total 1.50 feet. 



The height of the river above sea level is here 52.49 feet. For 



a drawing of the section at Saunders' Bluflf see Fig. 13. The 



bank is too steep to he examined in full detail, but we obtained 



fossil casts partly from ironstone blocks now lying at the base, 



but fallen from above, and partly from those in situ near the top 



of the fossiliferous strata, that is, at a height of 162 feet above 



datum line. 



Fossils prom Saunders' Bluff. 



Conus sp. Crassatellites dennanti, Tate 



Turritella miirrayana, Tate Meretrix eburnea, Tate 



Pecten foulcheri, T. Woods Meretrix, n. sp. (also at Skiuner's) 



Cardita polynema, Tate Bryozoa spp. 



Mytilicardita sp. (also at Skinner's) 



XII. LiNDENOW. 



Just opposite Saunders' Bluff", on the south bank of the river,. 

 an interesting outcrop of ironstone occurs. Between the twO' 



