At lEast it is true in the case of water. Although not as common there are many places where water descends downwards in a vertical shaft and enters a lower stream. Recently I unearthed another phenomon which is to be found where uppers and downers are reasonably close together. This is what I call the round and rounder. Diagram showing Uppers, Downers and Round and Rounders.
Arrows indicate the direction of flow.
There is a complex of stone circles and alignments at Beaghmore Co. Tyrone, one of the places where I took Sig when he visited me in May last. One of these circles is very unusual in that it has hundreds of smallish stones placed inside it. It is locally called the sharks tooth circle. At Beaghmore there is a lot of the kind of underground water that I am talking about. A very wide, deep river.