54 GEOLOGY OF LOWER MESOZOlC ROCKS OF QUEENSLAND, 



The Series also occupies a syncline, with an axis in a direction 

 approximately N.30°W.-S.30°E., between Hemmant and Wyn- 

 num, extending southwards to about the latitude of Redland 

 Bay, and northwards only just beyond the Brisbane River. 

 Further north, there is a parallel belt of the Bundaniba Sand- 

 stone extending from Toorbul Point in a direction approximately 

 N.SO'VV. through the Landsborough district. The presence of 

 the Bundamba sandstones has been indicated at Toorbul Point 

 by Mr. Cameron.* At this point, a bore (the Bribie View Bore) 

 in Portion 28, Parish of Toorbul, passed through 508 feet of 

 massive sandstones, with one or two seams of hard, black, sandy 

 shales and, near the bottom, pebbly conglomerates; no coal-seams 

 were observed in these sandstones. Mr. Cameron correlated these 

 sandstones with the Bundamba grits and conglomerates occurring 

 at Logan Village. The sandstones of the Landsborough district 

 have been correlated with the Bundamba Series by Mr. Dunstan. f 



It can thus be recognised, that there is a belt of the Bundamba 

 Series running through this area, and its position can be defined 

 in a general way, but the exact determination of its boundaries 

 would involve a careful geological survey of the whole area, and 

 it is not certain even then that the boundaries could be accu- 

 rately defined. 



This belt disappears towards the north-east under the southern 

 extension of the Tiaro Series, which is equivalent to the Walloon 

 Series. The distribution of the Series is indicated in Plate ii. 



The Helidon sandstones may be the equivalents of the Bun- 

 damba sandstones, as suggested by Mr. Dunstan,! but we do not 

 know sufficient detail of the geology of the Helidon district, at 

 present, to be sure of their position. 



(iii.) The Walloon Series. — The rocks belonging to this Series 

 cover a vastly wider area than either the Ipswich or Bundamba 

 Series. Their distribution is indicated in Plates i. and ii. In 

 South-eastern Queensland, they outcrop over most of the country 

 between a line drawn from just west of Esk to Toowoomba, 

 thence along the eastern foot of the Main Bange to the New 



* Ann. Rept. Dept. Mines, Queensland, 1908, p. 172. 

 t Queensland Geol. Surv., Publication No 252, p.4. 



