BY H. I. JENSEN. 89 



be gem-bearing, exists between Mt. Eerwah and the Bottle and 

 Glass in Yanganuien Valley. 



Around Buderim Mountain we have a tuffaceous sandstone, 

 indurated near the basalts, containing soft peaty strata, suggesting 

 a later age than Jurassic. Fossil wood, and obscure casts 

 resembling echinoderms and Maccoyellas, abound in this rock, 

 especially where it outcrops on the Maroochy beach. 



Carbonaceous shales are frequently interbedded with the sand- 

 stones. Thinnfeldia odontopteroides and its vai . -falcata occur in a 

 seam which outcrops in Petrie's Creek at Nambour, and is 

 associated with a thin coal seam. Coal seams have also been 

 observed elsewhere, as between the 78i and 79-mile pegs in the 

 railway cuttings near Cooroy. (See Text fig. 11b). 



All the sandstones exhibit much current bedding, proving 

 deposition in shallow waters subject to frequent changes in 

 the direction of flow. Probably they form an estuarine deposit; 

 the fossil wood was brought down by the rivers and deposited 

 near their mouths. 



Alluvial, Aerial, and Fluviatile Deposits. — 

 In a former paper I have already described such deposits at the 

 mouth of the Caboolture River. Text fig. 1 2 shows the position 

 of sand banks with shells of Potamides, Area, Natica, and Ostrea. 

 These are hurricane banks (shore banks) which have moved 

 inland by sedimentation at the river mouth, aided perhaps by a 

 slight uplift. 



More definite signs of uplift are in evidence along the coast all 

 the way from Caloundra to Noosa Head. All the swampy 

 country in this coastal strip shows definite evidence of being a 

 plain of marine erosion raised above tidal influence. Coolum 

 Mtn., Mt. Peregian, and Noosa Head were probably islands, and 

 Mt. Tinbeerwah a promontory. The swampy tracts of Coolum 

 and around the Noosa lakes are for the most part marine muds. 

 A raised beach with numerous shells occurs on Point Arkwright 

 at a height of 180 feet, and the Blackall Range (the low ridge 

 separating the Six-Mile waters from the swampy coast) west of 

 Tewantin shows signs of marine erosion. It was in fact the old 

 coast-line. 



