Previous to the year 1154 this channel was the main stream, and the two small branches into which it subdivides, called the Po di Volano and Po di Primaro, were in early times the two main outlets of the river.
Latitudinally the region subdivides naturally into several well- marked s,ih-rea-innc which most he hrieflir discussed.
Wagner subdivides the earth's surface, according to elevation, into the following five regions: Wagner's Divisions of the Earth's Crust.
Beketov subdivides it into two portions-the forest region proper and the " Ante-Steppe " (predstepie).
The latest classification of Molengraaff subdivides the beds as follows: - Beaufort beds of Cape Colony.