554 GREAT SERPENTINE-BELT OF NEW SOUTH WALES, V., 



seen in the Middle Devonian Series of the Dillenburg district, in 

 Germany(18), in the Carboniferous formation of the Isle of 

 Man(19, Vol. ii., p. 25), and elsewhere. As will appear later 

 (p.574), the same structure is developed in the Ordovician Series 

 of the West of Ireland, in association with a varied group of 

 rocks, some of which are remarkably like those of the Middle 

 Devonian formation of New South Wales(20). 



The various outcrops of limestone do not join up regularly 

 into two lines continuing the branches of the Seven Mile Creek 

 anticline. Sometimes three lines are present, sometimes only 

 one. The grey quartzite appears here and there in small amount. 

 The occurrences of pyroclastic rocks, which are indicated on the 

 map in a generalised manner only, are equally irregular in their 

 development, though all are approximately parallel. The dip of 

 the rocks is very steep {60°-85'' to the N.E. or E.N.E.), and the 

 exposures in the steep easterly-flowing gullies show much shear- 

 ing and shattering. All these features indicate that the Lower 

 Middle Devonian Series in the narrow zone along the margin of 

 the granite-massif, is affected by much strike-faulting and repeti- 

 tion, as well as simple folding. Intrusive into those rocks are 

 some small basic sills of porphyrite; that occurring in the south- 

 western side of portion 158, Woolomol, has phenocrysts of basic 

 labradorite, and has suffered very little from the metamorphosing 

 effect of the granite when compared with the pyroclastic rocks. 



We return to Seven Mile Creek, and now trace the Lower 

 Middle Devonian Series to the south-east. The continuous band 

 of limestone ceases by the Loder's Gully track to Tamworth, but 

 is represented beyond this by small isolated lenticular masses 

 which run round the wide open valley of Seven Mile Creek, and, 

 swinging round in a rough semicircle, are found again in the 

 small ridge west of TintinhuU railway-platform. 



Here the limestone is again associated with a small amount of 

 pyroclastic matter. Below the limestone, the regular sequence 

 of outcrops of claystones and tuffs curves in a similar manner, 

 dipping to the south-west, south, and finally to the south-east. 

 To the east of the anticlinal axis, they follow parallel to the 

 boundary of the granite, and dip steeply to the north-east and 



