Some of the world’s most exquisite fossil beds were formed millions of years ago during time periods when the Earth’s oceans were largely without oxygen.

A fossilized mantle of a vampyropod, a relative to the vampire squid. The ink sacis the raised structure in the center,
and muscles have a striated appearance [Credit: Rowan Martindale/The University of Texas
at Austin Jackson School of Geosciences]That association has led…

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Source: archeo