The oldest and most pristine aquifer formation beneath Long Island is the Lloyd Aquifer. The Lloyd formation is over 50 million years old and the water in it is as much as 8,000 years old, nearly as old as the last ice age. Because the Lloyd Aquifer is at the bottom of the sequence of aquifer layers located beneath Long Island, it usually takes decades for water to reach and replenish it. And it takes thousands of years for water in the Lloyd to slowly migrate to the coastline where it discharges into the Atlantica Ocean or Long Island Sound.