Stonehenge rocks are nearly 2 billion years old, study finds

It’s a rock of the ages.

A long-lost piece of Stonehenge has revealed the prehistoric monument is nearly 2 billion years old — giving new insight into its super-durable makeup, according to a new study. Robert Phillips, a worker restoring the monument in England in 1958, took home a rock fragment that was recently unearthed and studied by researchers at the University of Brighton in England.