NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Trilobite fossil (Elrathia kingii). This specimen of this extinct marine arthropod was found in rock matrix dating from the Middle Cambrian (around 500 to 513 million years ago), in the Wheeler Shale formation, located in the House Range, Utah, USA.
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