Most of the water in the Ogallala Aquifer accumulated during the Pleistocene.

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The Ogallala Aquifer is a groundwater system that is primarily located beneath the Great Plains in the United States. It is believed that most of the water within the aquifer accumulated during the Pleistocene geological era, which lasted from about 2.6 million to 11,700 years ago. During this time, glaciers covered much of North America and as they melted, they deposited sediment and created a landscape that would eventually fill with water and become the Ogallala Aquifer.

Most of the Water in the Ogallala Aquifer Accumulated During