"Fossil Aquifers are large underground, confined reserves of water that were established under past climatic and geological conditions. They are disconnected from the modern water cycle and hence cannot be replenished." (Martin-Nagle 2011)
Martin-Nagle, Renee. "Fossil aquifers: a common heritage of mankind." Geo. Wash. J. Energy & Envtl. L. 2 (2011): 39.