390 CitaiieH Fenner: 



Ford's Creek and tlie Broken l\ivei-, and these gradually become 

 lower as we go west. At the point (Fig. '2) where the Broken River 



bW 



iMilarg-ed diatjraujmatic section along dotted hne B m Fig. 



takes its sharp northerly turn, there is no divide whatever. (See- 

 Fig. 3.) An examination of the area makes it quite evident that 

 the upper Broken River originally flowed south-west through the 

 Black swamp, and on to the Goulburn. There is a gentle slope 

 south-west from the " elbow of capture," and deposits of coarse 

 river pebbles (quartzites, black cherts and porphyry) also occur 

 These deposits have been opened up for road making, and are quite 

 similar to those of the present Broken River. The capture has been 

 made by a small stream heading back through the Barjarg Gap. The 

 two signs of recent capture, as set out by W. M. Davis, l are to be 

 found : (a) a trench (about 90 feet deep in this case) above and 

 below the elbow of capture ; (b) the absence of a small tributary at 

 the elbow. The river, on turning north, passes through the 

 Barjarg Gap, a striking valley, which will be considered later. 



(e) Ford's Creek. — This small stream rises in the low Springfield 

 hills, east of Mansfield, flows for some ten miles west across the 

 Battery sandstones, and then turns south-west, cutting across the 

 strike of the silurian to the Delatite. Its interest lies in the fact 

 that, like the upper Delatite, the stream cuts through a very hard 

 ridge of thick quartzite, really a continuation of the South Blue 

 Range. (See Fig. 1.) It would appear to be a " superimposed 

 stream," having had its south-westerly direction prior to the 

 denudation that has left the quartzites standing as a low, but very 

 definite and continuous ridge. The roads to Loyola and Jamieson 

 take advantage of these two gaps. 



(/) Delatite River. — This rises in the highlands about Mount 

 BuUer, and is snow-fed for a large part of the year. It flows west, 

 and, while in the region of granites and hardened slates, the valley 

 is steep, rugged, and V-shaped. (See Fig. 4.) Upon entering the 

 level-bedded carboniferous sandstanes, the valley is wide and 



1 Geog^raphk-al Essays, p. 602. 



