Tertiary aquifers are those that occur in older Tertiary age sedimentary deposits (between 66 and 2.6 million years old). Geological reports, maps, and borelogs have been used to identify discreet aquifer units within the Tertiary age geological formations that exist in Southland. These formations consist of a combination of terrestrial, intertidal and marine deposits such as lignite measures and limestone. These are commonly overlain by younger Quaternary age alluvial deposits. Eight hydrogeologic zones have been identified. For more information about these aquifer zones please contact Environment Southland.
