Photo 18 Jul 3 notes Glaciers that melted more than two million years ago deposited layers of sediment around what is now the Chesapeake Bay. Underground rivers run between those layers, tapped by wells and recharged by rainfall over time. The water flowing in them is tens of thousands to more than 2 million years old, according to recently published research, a fact that had been theorized but never proved. The finding stacks Maryland aquifers up against the few to have been dated so old, including those underneath the Sahara Desert and the Australian outback. And it shows that a resource many take for granted cannot, in fact, be renewed on a human time scale, geologists said. (via Maryland groundwater dated to more than 2 million years old, geologists find - Baltimore Sun)

Glaciers that melted more than two million years ago deposited layers of sediment around what is now the Chesapeake Bay. Underground rivers run between those layers, tapped by wells and recharged by rainfall over time. The water flowing in them is tens of thousands to more than 2 million years old, according to recently published research, a fact that had been theorized but never proved. The finding stacks Maryland aquifers up against the few to have been dated so old, including those underneath the Sahara Desert and the Australian outback. And it shows that a resource many take for granted cannot, in fact, be renewed on a human time scale, geologists said. (via Maryland groundwater dated to more than 2 million years old, geologists find - Baltimore Sun)

#environment #water #drinking water #water supply #hydrology #Maryland #Baltimore

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