300 foot above the present sea level, Deer Lake is said to be 15 feet above the sea. The 300 foot level is justly concordable with the elevated rocks we have seen along the west shore of Rift. The stream that runs from Deer Lake to Hunter Mouth is a widely U shaped rather than a V cleft. It is narrower at Hunter Mouth in the region of Castle Arm- Gorge at the foot of Deer Lake where it was blocked by from 60 to 70 feet of sand through which it has cut down to the present level. The cuts to the north at the foot of Deer Lake are composed of Paleozoic strata dipping N. & S. at about 45-55°. These strata continue to Hunter Mouth and beyond. Breakfast Head are for a mile towards Deer Lake are of limestone in the Ordovician series. As one gets towards Hunter Mouth the gorge becomes very narrow and is a steeply U shaped cleft. At the foot it is not over half mile wide while at the head it is between 2-3 miles across.