496 GREAT SERPENTINE BELT OF NEW SOUTH WALES, i., 



(a) The lowest beds of the series are the Woolomin Beds. These 

 occur exclusively on the eastern side of the serpentine-line, and, 

 therefore, are always greatly altered. Their most noticeable fea- 

 ture is the presence of a well-defined zone of red, unbanded jasper, 

 in which traces of radiolarian remains are frequently visible. In 

 addition to this, the series contains a very large amount of altered 

 spilitic rocks, schistose tuffs, slates, phyllites, and horn stones. The 

 whole series is intersected by numerous quartz-veins. The relation 

 of these beds to the Tamworth Beds is probably one of strict con- 

 formity. In the region north-east of Manilla, where the Tamworth 

 Beds are believed to occur east of the serpentine-line, there is no 

 suggestion of any discordance between them and the enclosing 

 Woolomin Beds ; moreover, the occurrence, in each, of spilitic lavas 

 and radiolaria, argues that they are merely different portions of 

 one sedimentation-series. It will need a long and intricate study, 

 both microscopically and in the field, to delimit properly these two 

 formations; and until that is accomplished, it seems best to indi- 

 cate on the map, with one hachuring, the whole of the eastern series, 

 making reservations in the text. The bulk of the eastern series is 

 probably of Lower Devonian age. 



(5) The Tamworth Beds are those that have been studied in 

 most detail, particularly by Professor David and Mr. Pittman(3), 

 who gave a section showing their occurrence at Tamworth. The 

 most typical and complete section appears to be developed at 

 Bowling Alley Point, however, and of this the following is the 

 order : — 

 Thickness. 



3,300ft. Upper Tuff-breccias. 



2,000ft. Upper Banded, Radiolarian Clayst ones (with Spilites). 



20-1 50ft. Limestones. 



4,000ft. Lower Tuff-breccias. 

 600ft. Lower Banded, Radiolarian Claystone. 



10,000ft. 



The thickness, however, is only very roughly determined, and it 

 is very probable that considerable repetition has occurred. In 



