The brook burbles down the slope, bouncing off the exposed rocks and rubble in the gully, washing soil from the banks beneath the hanging tangled roots of the great deciduous trees. Newly-hatched flies weave and gyrate in the cool sunlight above the little pools and backwaters that gather beneath and behind the waterfalls. The exposed rocks are pocked by smooth circular potholes, worn by the swirling stones caught up in the infrequent floods. At present, though, the stream is flowing with gentle splashes and gurgles, through the V-shaped cleft in the soil, and downwards through the wooded hillside towards the distant plains.