Sentences with phrase «hardened volcanic ash»
Geologists study rocks called tuff, or hardened volcanic ash, that they can date using specialized tests.
https://www.nationalgeographic.org/
In fact, fossils unearthed in the Tulu Bor flood plain, which blanked the basin near Mount Kulal, are embedded in tuff, or hardened volcanic ash.
BIG MARKS Footprints of the largest known Australopithecus afarensis, dating to nearly 3.7 million years ago, have been found in hardened volcanic ash at Tanzania's Laetoli site.
The new results might even help earth scientists who seek to infer the thickness of Earth's ancient atmosphere based on the size of raindrop craters left in now - hardened volcanic ash.