238 GREAT SERPENTINE-BELT OF NEW SOUTH WALES, vi., 



road, and again as serpentine-gossan on Myall Creek. Two 

 miles to the north of here, it is only a few yards wide, but, six 

 miles further north, east of Mt. Rodd, it is 200 j^ards wide, and 

 is covered by Jurassic(?) sandstone. It pinches out to the north, 

 but occurs again on Mr. Hamilton's property on Oakey Creek, 

 where it is 200 yards wide, consisting of massive and foliated 

 serpentine with a little gabbro. It appears again to the north 

 in Kelly's Gullj^ in the section described below (Text-fig. 2, p. 244), 

 and thence disappears beneath the sandstone-hills to the north. 

 This is the most northerly occurrence of the rocks of the Great 

 Serpentine Belt. 



iii. The Near We.^terii Zone. 



This zone lies immediatel}' west of the Serpentine Line, and 

 may be assumed to extend to a line which joins the east side of 

 Pyramid Hill, near Manilla, to the east side of the Bingara Range. 

 It is of very complex structure, consisting, for the most part, of 

 Upper Devonian Barraba Mudstones, with Middle Devonian 

 Tamworth Rocks to the south on the Namoi River, and to the 

 north in the valley of Hall's Creek. The rocks are greatly folded, 

 frequently dipping isoclinally to the east. Near the serpentine, a 

 long strip of Carboniferous rocks has been infolded, extending 

 from the Namoi to the head of Hall's Creek, and appearing 

 again at Oakey Creek, south of Warialda. 



We commence at the south once more. In the section (Fig. 1, 

 Plate XX.) above the letter D, Middle Devonian rocks are shown, 

 and mapped on Plate xix., as occurring east of the hills that 

 bound the Manilla Valley, and forming the majority of the low 

 land in the Parish of Veness, north-east of Manilla, While this 

 is not definitely proved, it is the most i:)robable explanation of 

 the facts observed in the short time available here. The rocks 

 are soft or cherty radiolarian claystones, which may be traced 

 southward across the Namoi River to Yarrumbully Creek, where 

 they contain lenticular masses of limestone, probably on the 

 Moore Creek horizon. The western portion of the Middle 

 Devonian beds noi-th of the Namoi, dips gently to the west, but 



