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The discovery helps reveal the weird way trilobites ate and perhaps why they went extinct Paleontologists studying rocks from Morocco have unearthed the most exquisitely preserved trilobite fossils yet discovered. The new lifelike fossils update our understanding of the evolution and biology of these extinct ocean-dwelling arthropods. The details are so great that soft tissue parts of the trilobites, including the mouth and digestive tract, are clearly visible, researchers report June 27 in Science.
Such parts are typically lost as the animals turn into fossils. They proliferated in the ocean for about million years before going extinct at the end of the Paleozoic era, some million years ago.
Trilobite fossils are extremely common because their hard exoskeletons make it relatively easy for the animals to become fossils. To uncover how these trilobites and their tissues became so well preserved, Paterson and his team enlisted Robert Gaines, a geologist at Pomona College in Claremont, Calif. It happened like this: First a volcano exploded, and superheated ash flowed from the eruption into nearby coastal waters.
The ash dissolved and then remineralized out of the water, covering the exposed trilobites and entombing them in a matter of hours to days. The key step in this process, Gaines says, is that the ash hit water before hardening around the trilobites; without the cooling effects of ocean water, the hot ash would have burned the trilobites away. Besides being ready for a museum showcase, the fossils open new windows onto trilobite biology and evolutionary history.
