HT R. H. CAMhAGK. o43 



at 9 miles. Within this distance, however, an important 

 change takes place, as although the road at the 4-mile post 

 is only about 80 feet higher than at Camden, or 307 feet 

 above sea-level, during the succeeding 4.^ miles, the ascent 

 amounts to 660 feet; and, at a point in this ascent, the 

 Hawkesbury Sandstone makes its appearance, and with it a 

 change in the local flora. The cause of this sudden change 

 of levels has been brought about by the faulting down or 

 folding of the shale-area towards Camden, and the feature 

 is a continuation of the well-known Lapstone monoclinal fold 

 just west of Penrith. After the summit is reached, at 

 about 966 feet above sea-level, the shales are noticed to be 

 much denuded, and gradually thin ovit in the course of a 

 few miles towards Burragorang. A volcanic dyke, about 

 3 feet wide, occurs on the left hand side of the road-cutting, 

 about a quarter of a mile short of The Oaks. 



From The Oaks to the top of the mountain overlooking the 

 Burragorang Valley, a further distance westerly of 9 or 10 

 miles, the country rises at a gradual slope from about 950 feet 

 at the village, to approximately 2000 feet on the cliffs over- 

 looking the valley, though the road does not pass over the 

 highest point. The Wianamatta Shales disappear after the 

 first few miles, and the remainder of the road is over Hawkes- 

 bury Sandstone. 



The following section of levels from Camden to Burrago- 

 rang, kindly supplied by W. Claude Wilson, L.S., will be 

 found very valuable for reference : — 



