58 



which the strike and dip vary with every few yards, from 

 horizontal to vertical, the dip tending east and west. From 

 the Government well, situated in the creek, the beds become 

 more regular (going north), the siliceous shales showing a 

 dip N.E. ai> 50°. 



On the bank of the creek are some very large spheroidal 

 masses of siliceous quartzites, and these occur again, higher 

 up the creek, containing dark lines, and have a dip N. 20° W. 

 at 45°. This spheroidal weathering in homogeneous siliceous 

 rocks, as well as the dark lines, often cross-bedded, are very 

 characteristic features of the Upper Cambrian beds of the 

 Flinders Raiige. 



V; Trip Five Mile^ North of Blinman. 



Followed the road on the eastern side of the mine, 

 which passes over a flat and trends in a north-westerly direc- 

 tion. Dr. Lander drove me to Little Willigon Creek, which 

 is separated from the Willigon by a ridge, at about 5 miles 

 from Blinman. Left the conveyance and proceeded on foot. 

 The Little Willigon Creek cuts through the ridge mentioned, 

 in a small gorge, with shales on the one side and limestone 

 on the other. The limestone, which makes the ridge, at the 

 gorge, shows a structure of concentric lines like globules 

 1 in. to 2 in. in diameter, which weather into depressions; 

 it has also inclusions of shale in angular fragments. It is 

 underlain by flaggy shales that dip N. at 35 '^. 



By climbing the ridge between the Little Willigon Creek 

 and the main Willigon Creek (a distance of about three- 

 quarters of a mile), from its highest point the geological 

 structure of the country could be well seen. An imposing 

 range on the north side (4 miles distant) marks the limit of 

 vision in that direction with a steep scarp face on the southern 

 side, apparently composed of flaggy shales with interbedded 

 impure limestones. Then followed an inner range of rounded 

 hills covered with green feed, approximately 2 miles wide. 

 From the physical features I concluded that this area was 

 composed of purple shales. Another range, at a shorter dis- 

 tance, occupied the space down to near the Willigon Creek, 

 and showed a steep face to the southward composed of flags 

 and thin limestones. All these outcrops to the north of the 

 creek could be distinctly seen to dip northwards, giving a 

 section of 4 miles in diameter. 



On the southern side of Willigon Creek there is a suc- 

 cession of hills increasing in altitude towards Blinman, con- 

 sisting chiefly of impure limestones with some flaggy shales. 

 About one mile from the gorge of the Little Willigon Creek 

 the road crosses a small tributary of the latter in which 



