522 GEOLOGY AND PETROGEAPHY OF CLAREJJCETOWN-PATERSON DISTRICT, ii., 



The interesting group of roeks on the Langlands Estate is then crossed and the 

 line of section comes upon the Basal Stage beds. These are seen to roll over to 

 the south-east and the hornblende-andesite is found with dip-surface just before 

 the Williams River is crossed, after which a long line of Volcanic Stage rocks is 

 seen. These are exposed in the Gilmore ridge and to the east a large fault, Fs, 

 is encountered, causing a repetition of part of the beds and the appearance of 

 the Burindi Series in juxtaposition with the Glacial Stage. The section ends upon 

 the easterly dipping' Kuttung rocks. 



Section X Y Z. (Text-fig. 2.) 



The section along the line X Y Z traverses the area in a direction generally 

 parallel to the axes of the folds, thus giving the succession of the beds right 

 from the Burindi Series to the Permo-Carboniferous System. 



Near Wallarobba the lower members of the Volcanic Stage are found dipping 

 to the north-north-east, the conglomerates and tufts of the Basal Stage appear- 

 ing as one comes south. Just beyond the Wallarobba Tunnel the passage into 

 the Burindi Series occurs, details of which were given in the former paper. 

 Here the dip begins to change and along the high land between the Tunnel and 

 Mt. Douglas the beds lie very flat. Just to the north of Mt. Douglas a fault 

 occurs throwing down the Kuttung Series. There are outliers of Tertiary basalt 

 hereabouts, and then the section passes on to the Volcanic Stage. A long line of 

 outcrops of these rocks occtirs until the northern side of Tucker Creek Valley is 

 reached, where the Glacial Stage beds begin at the foot of a timbered slope com- 

 posed of hard toscanite (Mt. Gilmore type) and dacite. 



The lower portion of the Glacial Stage then gives rise to country of medium 

 relief, this being succeeded near Paterson by the rugged hills of toscanite 

 (Paterson type). The northern scarp of Hungry Hill is very steep and presents 

 a striking example of differential erosion. On the southern side of the dip-slope 

 the lower portion of the Glacial Stage reappears, as a result of strike faulting, 

 and is in turn followed by the Paterson toscanite. This shows a variable inclina- 

 tion and eventually dips down in a local trough near Dunn's Creek. A long 

 stretch of mature country is the expression of the Main Glacial Beds which pass, 

 apparently conformably, into the Lower Marine Series. 



The two sections just described are essentially at right angles in their 

 directions, but can be drawn along the general dip directions of the strata, thus 

 indicating the plunging nature of the folds. 



Faulting. 



The area under consideration is extensively faulted and the writer proposes 

 to go into some detail in connection therewith. 



An inspection of the map (Plate xxvi.) shows the general parallelism of the 

 major faults, the average trend being N. 20° E. In addition to these essentially 

 meridional faults there are two fairly important faults whose strike makes a wide 

 angle with the direction of the major set. Numerous small dislocations and 

 series of step faults are found in the railway and road cuttings, and in the State 

 Quarry at Martin's Creek. Here a very interesting set of structures was to be 

 seen at the time of the writer's last visit. Numerous small faults, and examples 

 of sliding between adjacent masses of andesite were in evidence. These structures 

 were probably developed when the folding occurred, the lines of movement being 

 determined by the joint systems, whose formation preceded the latter stages of 

 the folding. 



