Artistic reconstruction of two species of trilobite an instant before burial in a flow of volcanic ash 510 million years ago. Image credit: © Prof. A. El Albani, Univ. Poitiers =================================================================== Trilobites that date back 508 million years have been found preserved in volcanic matter, revealing never-before-seen details in 3D form. Their fossilization was so rapid that tiny shells have been preserved in situ, and soft tissues including mouthparts and internal organs can still be seen. The trilobites were entombed in pyroclastic flow, which is the hot, dense material that comes hurtling out of volcanoes sometimes reaching speeds as high...