242 



already been described. At about three-quarters of a mile 

 east of the Finniss Bridge, a sharp line of distinction is ap- 

 parent where the glacial sands and clays abut against these 

 old slates of Mount Observation. Quarries have been worked 

 in the glacial clays and grits for road-making. The clays 

 are dense, whitish, and often penetrated by strings of sandy 

 material irregularly distributed through it. Numerous 

 rounded pebbles, some of which proved to be granitic or other 

 stones foreign to the neighbourhood, occur in the area. 



The main road going south from the Finniss Bridge 

 shows many exposures of the glacial beds in road - cuttings. 

 The beds carry numerous stones lying at all angles to each 

 other, while the bedding is very mixed and tumultuous in its 

 arrangement, often showing vertical or strongly-contorted 

 layers. 



The road continues to follow the glacial valley which 

 widens out in its southerly extension, passing from the Hun- 

 dred of Kondoparinga to the Hundred of Nangkita. Wide 

 flats extend between the road and the River Finniss on the 

 western side, and low scrubby hills of glacial sandstone occupy 

 the eastern side of the road. Near the boundary of the two 

 Hundreds the stone has been worked for making the roads. 

 The glacial grits are here very hard, and take the form of 

 cemented conglomerates outcropping near the summit of the 

 ridge. There has been a considerable shed of broken material 

 and gravel down the steep slopes of the hill, and the road 

 metal has been largely gathered from this source. The depth 

 of the respective workings does not exceed 2 ft. On the ex- 

 treme summit of the ridge the old slate rocks are exposed. 



In several of the cuttings on the road, granite and other 

 erratics were noted, but the granitic examples were all greatly 

 decomposed. Resting on the undisturbed glacial beds newer 

 deposits of sands and gravels are frequently seen. Whilst 

 the material in these recent beds has been largely gathered 

 from the local glacial deposits, they can be easily distinguished 

 from the same. The newer beds are less indurated than the 

 glacial, and have been laid down by stream action, and are 

 more regularly distributed and stratified. They mark the 

 old river-levels during the excavation of the present valley of 

 the Finniss. 



As the South Road passes into the Hundred of Nang- 

 kita there is a great widening out of the old glacial area, the 

 characteristic swamp country is met with, and the great 

 glacially-formed Nangkita basin, already described, is within 

 view. 



