BY W. N. BENSON, W. S. DUN, AND W. R. BKOWNE. 297 



siliferous . Theb^c imidstoues are about tilty feet thick. Upon them lie conglom- 

 erate Or bouldery beds, interstratifled with flne-gi'ained tull containing plant re- 

 mains. On the steep sides of the hill in portions 320, 321, immediately south of 

 Mr. Proctor's homestead, Mr. Browne and Mr. Waterhouse obtained from this 

 horizon a number of fossil plant-remains, including Rhaeopteris intermedia, 

 Aneimites ovata, and reed-like impressions, possibly of Calarmtes. These beds 

 are followed by the gritty felspathic rock which is desci-ibed below as the main 

 felspathie grit. Tlie total thickness of the beds here described as forming the 

 lower moiety of the Middle Portion of the Kuttung Series is about thirteen hun- 

 dred feet. They are grouped together as the Lower Glacial Beds. The main 

 "varve" zone may be traced to the south, and has been studied two miles from . 

 here, where the eastern branch of Rocky Creek approaches Sandy Gully (portion 

 278). The ridge separating Rocky Creek from Sandy Gully consists of a succes- 

 sion of banded mudstones, felspathic tuffs, narrow zones of tillite and traces of 

 varve rock overlain by a definite zone of tillite. The main "varve" zone follows 

 this, and can be seen in the valley of Rocky Creek below the northern sharp 

 bend, and it is followed by the main felspathic grit {see Text-fig. 3a, Section iii., 

 E — F). The boundaries of the glacial beds southwards from here are largely con- 

 jectural. 



North of Currabubula Creek, still more distinct evidence of glaciation is 

 available (see Text-fig. 3a, Section ii., C — D) . Tracing the sequence of beds up 

 from the valley of Turi Creek we find that the upper portions of the easterly 

 facing slopes are rather too covered with shed rock to yield a clear succession to 

 a hasty traverse. The rocks appear, however, to be felspathic grits with 

 pebbly layers and some well stratified material, and possibly represent the lowest 

 "varve" horizon. Above these, forming the almost vertical cliffs at the scarp edge, 

 IS a thick stratum of boulder-bearing rock which ])erhaps is more like a normal 

 conglomerate than a tillite Above it, is a narrow zone of fine-grained, creamy, 

 felspathie tuff containing abundant remains of Rhaeopteris intermedia, Aneimite' 

 ovata and Calamite-like impressions. These were first obtained here by Mr. 

 Cambage (19). Probably, also, the Archaeocala/inites was obtained from this 

 .spot (20). These plant-beds are followed by a thick zone of tillite, which forms 

 the highest part of the ridge where it is crossed by the line of section (C — D), 

 and may be traced down the valley of Browne's Creek. Here the glacial origin of 

 the rock is shown, not only by similarity of the structure to that of a boulder 

 clay but by the presence of polished striated and more or less faulted pebbles 

 collected by Professor David and Mr. Browne.* These are, however, difficult co 

 obtain, for the matrix of the tillite is strongly cemented. Moreover, as in the 

 Paterson-Maitland District, the striations are found almost solely on the quartzite 

 pebbles, the boulders of granite, porphyry and ajilite being generally withoui 

 striation, though they are often only partially rounded. The largest boulders are 

 of granite which may be over two feet in diameter. Above this tillite lies the 

 main "varve zone" first discovered by Browne, and Mell exposed here in Browne's 

 Creek. Here the contorted character of the rhythmically banded "varve" rock is 

 most striking (se.e Text-fig. 4) and so also is the presence of abundant erratics of 

 granite, some over a yard in diameter, embedded in these fine-grained sediments 

 (ser Text-figs. 5 and 6) . The main varve zone is followed as usual by laminated 



•For photographs of glaciated pebbles from Browne's Creek and Eocky Creek see Plate 

 xxiv., figs.9,10 of section B of this paper, to appear in Part 3 of these Proceedings for 1920. 



