The rock was almost exclusively granitic isolated blocks; detached heaps, and low ridges composed of it were frequently met with in the open forest.

We passed two small hillocks of milkwhite quartz; fragments of this rock, as well as of calcareous spar, were often observed scattered over the ground.

The river here made a large bend to the northward, still keeping parallel to Robey's Range, or a spur of it; and, when it again turned to the westward, another fine high range was visible to the north by east and north-east of it; which I named "Porter's Range," in acknowledgment of the kindness of another of the contributors to my expedition.

Its latitude is about 20 degrees 14 minutes.
April 7 .-- Travelled about ten miles N.70 degrees W.The country became more level, more open, and better grassed; the gullies were farther apart, and headed generally in fine hollows.

Two large creeks joined the river from the westward; and a still larger one came from the northward, and which probably carries off the water from the country round a fine peak, and a long razorback mountain which we saw in that direction.
North-west of Porter's Range, and between it and the razorback, were two small peaks.