96 CONTEMPORANEOUS BASALT, ETC. 



Traversing the rocks from east to west I obtained the fol- 

 lowing section : — 



Grits about 240 ft. thick. 



Hardened Shales with crinoidal 



stems ... ... ... ,, 835 ,, 



Shales and Sandstone ... ... ,, 320 ,, 



Bluish Limestone with crinoidal 



stems and Brachipoda ... „ 175 ,, 

 Break in Section (probably shales) ,, 280 ,, 

 Olivine Basalt ... ... ... „ 50 „ 



Shales 

 The grits, limestone, and basalt crop out somewhat promi- 

 nently, forming three small parallel ridges, running of course in 

 the same direction as the strike of the beds. I followed along 

 these beds for a distance of about one quarter of a mile, and 

 could trace them with my eye for some distance, but the 

 inclemency of the weather prevented me traversing them 

 further. 



At the edges of the basalt, in places, a dip coincident with 

 that of the other beds is observed. 



These few notes have been written with the object of placing 

 on record the occurrence of a comparatively unaltered basalt* 

 and one which resembles in nearly every respect many of our 

 late Tertiary basalts in the " Gympie Beds," as, so far as I 

 know, this is the first time such a thing has been observed. 



My colleague, Mr. R. L. -Jack, in his Report pn the Bowen 

 River Coalfield, 1879, has reported the occurrence of interbedded 

 basalts, which he informs me are somewhat similar to the 

 specimen produced, in the volcanic ranges of Mount Macedon 

 and Mount Devlin in rocks of the Lower Bowen Formation, the 

 middle member of the Permo-carboniferous System. 



In my Report on the Gympie Goldfield, 1889, 1 myself have 

 described interbedded volcanic rocks in the type district, but 

 these are much altered amygdaloidal diabases. 



