The Adelaide plains region, South Australia, is a downfaulted block composed of Tertiary and Quaternary beds overlying a Precambrian basement. The principal source of the artesian or subartesian waters of the marine Miocene-Pliocene formations, as well as of shallow ground waters, is rainfall runoff draining from the Mt. Lofty highlands to the east. Quality of the water varies from potable to extremely saline; in general, the latter type is found at shallow depths adjacent to estuarine localities.

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