198 
APPENDIX. NO. IV. 
This formation may be said to terminate the rocks con- 
nected with the dividing ranges, since it is the last that occurs 
at their western base. 
A little below the Cataract, the county undergoes a re- 
markable change, and becomes extremely depressed. 
Porphyry with Feldspar. — Colour dull red, with white spots, or 
grey with red spots; very hard, compact, sonorous, magnetic. 
[See pp. 27 and 115.] Composition of Mount Harris, a hill 
called by Mr. Oxley, elevated about 170 feet above the level 
of the plains. It lies 53 miles to the N. N.W. of the 
Cataract, and is about 16 miles distant from the first of the 
marshes of the Macquarie. 
Porphyry with Feldspar. — Colour grey with red spots, similar to 
the last. Was not observed to affect the needle. Formation 
of Mount Foster. Mount Foster is more than 200 feet in 
height, and lies about 5 miles to the N. N. W. of Mount 
Harris. From the summit of both, Arbuthnot’s range is visi- 
ble, bearingnearlydue east, distant 70 miles. [See page 28.] 
Quartz Rock varieties — Slaty Quartz varieties. — Composition of 
the first elevations to the Westward of the marshes of the 
Macquarie, called New Year’s Range, a group of five hills. 
The loftiest about 200 feet in elevation ; distant about 80 
miles to the N. W. of Mount Harris. 
Granite. — Colour red, coarse-grained. Composed of Quartz, 
Feldspar, and Mica. 
Granite, Porphyritic. — Colour light red. Both occur in the bed of 
New Year’s Creek, traversing it obliquely, and are visible for a 
