It was set in younger rock, which was perhaps 400 million years old.

Eight hundred million years of younger rocks have been deposited on this "basement" foundation.

Part of that was getting younger rock acts.

The younger Cretaceous rocks form the cliffs here in the east.

Large portions of the central area are covered by younger rocks.

Its remains come from slightly younger rocks than L. lambei.

The oldest part of the coast is found at its west end, while progressively younger rocks form the cliffs here to the east.

The youngest rocks are found in south east England.

L. D. showed me his mud, he called it "very young rock."

It is revolutionary and militant where most angry young rock is liberal at best.