It was found in strata 2.1 billion years old.

Rosa herself was an excavator of very many old, people-bearing strata.

Being trollish, they could move through the smallest passages in the earth and come up under old strata.

The word burna was used for a stream in the oldest strata of Old English toponyms.

These rocks are the oldest strata of the Devonian gas shale sequence.

Megyer belongs to the oldest strata of Hungarian toponymy.

The older strata are exposed south of Lake Los Barreales.

No terrestrial bones have been found in the older strata at Vampiros-1 or Vampiros-2.

Maybe I can get to older strata without digging, he thought.

The frescoes of the chapel were painted in 1776 but older strata of paintings were recently discovered under them.