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trilobite fossil recordCNN
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88% Informative
About half a billion years ago , a volcanic eruption near a shallow sea in what’s now Morocco preserved some of the most complete specimens ever found of buglike sea creatures called trilobites.
For 515 million years all evidence of those trilobinites stayed hidden, buried at a site called the Tatelt Formation in the High Atlas mountain range.
An international team of researchers recently used high-resolution X-ray microtomography to peer through the layers of the ancient tombs.
The specimens ranged from about 0.4 inches ( 11 millimeters) to 1 inch ( 26 millimeters), long.
One specimen had tiny shelled animals called brachiopods clinging to its face.
The suddenness of the Cambrian volcanic eruption preserved evidence of neighbors that shared the trilobites' marine habitat.
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