GEOLOGY OF THE GLOUCESTER DISTRICT, N.S.W. 243 



thickness of 10,800 feet. This section has been taken from 

 the valley of the Barrington River, on the western side of 

 the Gloucester Buckets. 



(a) The Conglomerates. — Several beds of conglomerate 

 occur at and near the base of the Burindi Series, ranging 

 individually from 20 to 40 feet in thickness. They contain 

 well waterworn pebbles of quartzite, quartz-porphyry, 

 aplitic-granite, and a dark coloured felspar porphyry; the 

 pebbles ranging up to 12 inches in diameter. A few small 

 pebbles of a cherty rock, not unlike the cherts which occur 

 in the Devonian Series, have also been found. These con- 

 glomerates may be seen crossing the Oopeland road, about 

 one mile west of the Barrington Bridge, and also along the 

 Nowendoc road, about half a mile north of its junction 

 with the Oopeland road. A bed of conglomerate also occurs 

 at the junction of the Oopeland and the Bowman River 

 roads. This bed is over 100 feet thick, and contains many 

 large pebbles. Its position is about 5,000 feet above the 

 base of the Burindi Series. 



(b) The Mudstones. — These form the bulk of the Burindi 

 Series, aggregating many thousands of feet in thickness. 

 They are blue-black to greyish-green in colour, very fine 

 grained, and typically thin bedded. Tuffs are frequently 

 interstratified with them. Certain bands contain marine 

 fossils, but these fossiliferous bands appear to be few and 

 far between. The fossils they contain are listed on page 245. 

 At different horizons, fairly abundant fragments of fossil 

 plants are found, including imperfectly preserved stems of 

 Lepidodendron and Archseocalamites. This appears to be 

 drift material. 



(c) The Limestones. — Three distinct limestone horizons 

 occur in this series. The lowest bed, about 80 feet thick, 

 is a coarse, crinoidal limestone, the crinoid stems ranging 

 up to three-quarters of an inch in diameter. It can be seen 



