232 fiREAT SERPENTINE-BELT OF XP^V SOUTH WALES, VI., 



are considerably altered. The limestone, invaded by the ser- 

 pentine, has been strongly metamorphosed, and (Professor David 

 thinks) in part absorbed by the peridotite-magma. Adjacent to 

 it, are some of the limestone-bearing spilitic tuffs, like those in 

 the Nemingha horizon. A quarter of a mile to the south of 

 here, the limestone contains traces of a cyathophylloid coral, and 

 some unrecognisable brachiopods; beyond this i^in Portion 184, 

 Bingara) it has become very schistose. 



Passing up the Gwydir River, the first few miles lie in a gorge 

 cut in phvUites, altered tuffs and jaspers, which Professor David 

 found to be radiolarian(16, 17); but beyond the junction of Gouron 

 Gouron Creek, the banks of the river become low, and a great 

 lowland extends far to the south, on which are low ridges of jasper, 

 and low undulating hills of Tertiary drift capped with basalt. 

 Somewhat higher jasper-hills occur further east at Keera Station, 

 and, beyond these, rises the granitic region near Copeton described 

 by Anderson (11) and Cotton (37). North of the Gwydir River, 

 near the junction of the Gouron Gouron Creek, and again two 

 miles noi'th-Nvest of Keera, are small, lenticular masses of lime- 

 stone (according to local report). This area of lowland sur- 

 rounded by hills has been termed the Keera 8enkungsfeld(37). 

 (See also p. 273). 



Between Bingara and Warialda, very little study has been 

 made of the Eastern Series. Near Myall Creek, east of the 

 serpentine, are large, pink lenses of limestone Hke those of the 

 Nemingha horizon; but, two miles further north, the limestone 

 has returned to the west of the serpentine, and continues thus 

 to Warialda. At Oakey Creek (Mr. Hamilton's property), very 

 little jasper occurs east of the serpentine, the rocks being chiefly 

 indurated claystone. North of Kelly's Gully, the Series dis- 

 appears beneath Jurassic(?) sandstones in which Stonier found 

 Alethoptrris, Brachyphyllum, and Flnjlhqjter is (22). Near 

 AVarialda, these sandstones pass into arenaceous conglomerates 

 and arkoses, which contain pebbles of black jasper and quartz. 

 The current-bedding is well marked, and, in the small region 

 studied, ha.> an inclination predominantly to the north-west. 



