GEOLOGICAL DISTRIBUTION
The potash deposits of northern Germany lie in the midst of a series of formations known as the Zechstein, the geologic age of which is Permian. Both the Alsatian and Spanish deposits are found in Oligocene Tertiary rocks, although the deposits were not necessarily strictly synchronous in origin. The Galician deposits are described as of lower Miocene (Tertiary) age. These are the principal known bedded deposits of potash in the world, for which as a class the distinction as to geologic age seems to have a special significance. The association of potash with the large salt and gypsum deposits of the world seems for some reason to have been exceptional in geologic history. But the determination that these somewhat analogous occurrences have been formed at various times and places is a good basis for expecting that similar deposits may yet be discovered elsewhere.