NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Specimens of oldest rocks on Earth. Selection of specimens of the oldest known rocks found on Earth. At centre (one specimen halved) are volcanic ash pebbles from Greenland, dating from around 3.824 billion years ago. At left is a banded iron formation (typically more than 3.7 billion years old). At right is a sample of Amitsoq gneiss (typically 3.8 billion years old).
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