63 



As the high range, which runs in a south-west and north- 

 east direction, is approached, foot hills consisting of dolomitic 

 rock and quartzite flags are met with, forming the mouth of 

 the gorge, and basic igneous dykes are seen on both sides 

 of the road, averaging a distance of about a quarter of a mile 

 apart. The one on the southern side of the road makes a 

 prominent outcrop, about 30 ft. in width, but soon either 

 runs out or is obscured by surface drift. The other, on the 

 northern side of the road, is about 25 yards wide and strikes 

 N. 20° W., and, at half a mile, crosses the road. Shortly 

 before this it appears to bifurcate, the two branches with 

 the sedimentary interval having a width of about 100 yards. 

 Shortly before reaching the road it crosses a small creek, 

 near a dolomitic limestone which has a breadth of outcrop 

 of 6 yards, and is much altered by contact with the dyke. 



The gap in the ranges is about 4| miles from Blinman. 

 The first definite range is composed entirely of quartzite, 

 which, on weathering, breaks up into flags: dip N. 20° W. 

 at 65°. Mount Elkington is the highest point in this range. 

 The next range, in the same gap, at a distance of 5 miles 

 from Blinman, is more flaggy, with a dip N. 10° E. at 55°. 



VIII. South Blinman and Road to Wirrealpa. 



At a half-mile distance from South Blinman there is a 

 low outcrop, on the right hand, consisting of flagstones with 

 similar rocks forming a prominent range on the left, with a 

 considerable discordance of dip in relation to each other. 

 The beds on the right-hand side of the road show a dip 

 S.E. at 55°, and are overlain by thick dolomitic limestones; 

 while those on the left hand make escarpments, facing the 

 west, ,at a dip N. 70° E. at 35°, and have a gradual slope 

 to the east. 



Beyond this range, to the eastward, is a considerable 

 plain, 2 miles across, with numerous outcrops of dolomitic 

 rock, interspersed with shales, apparently flat, and even with 

 the ground, or nearly so. The variations of outcrops on the 

 plain are as follow : — Near the last-mentioned range, at its 

 eastern base, are thick limestones almost even with the ground. 

 At 1 mile from the range there are limestones that show a 

 kind of pseudo-vermiculate structure, with a dip of 15° E. 

 At the end of the next half-mile is a ridge, 20 ft. to 30 ft. 

 in height, consisting of limestones with oolitic structure, and 

 includes some sandstone bands: dip E. 25° S. at 10°. For 

 about another mile the road is on purple shales that form 

 low exposures, the road following very nearly the line of 

 strike. 



The road passes into Paddy's Creek, at the head of which 

 are flagstones and shales, with a dip of 17°. 



