Scientists know this because they have examined 1.5-million-year-old fossils they unearthed and ... and showing they were formed at the very spot of soft sediments where they were found.

The soft tissue is fragile – skin, internal organs, and connective tissues typically deteriorate before the stone has a ...

The fossils are estimated to be about 518 million years old, and are particularly unusual because the soft body tissue of many creatures, including their skin, eyes, and internal organs ...