They are also preserved in basins on the western plateau, as shown by brown coal deposits passed through in the Lake Phillipson bore.
In this valley were laid down, either in Eocene or Oligocene times, a great series of lake beds and thick accumulations of brown coal.
Germany, and containing brown coal and amber, has been met with only in Poland, Courland and Lithuania.
In the Tertiary region are found small quantities of iron ore and an indifferent brown coal.
This is a wooded chain of mountains, with many branches, rich in brown coal and culminating in the Göblberg (2950 ft.).