4.43 billion years ago, the sponge "refuge" left fossils or filled the record gap

活化石

On the same day, Li Lixia showed six fossils on the scene, one of which was ring-shaped in its entirety, with needle-shaped marks around it, and scattered cross-shaped needles... "It is flattened from the top, we can see one The ring-shaped fossil is surrounded by bone needles, and the surface layer is composed of different types of bone needles. Li Lixia pointed to a circular fossil. It is understood that these fossils were discovered on a hillside in Min County, southern Anhui.

"At the slope, when the water rises, he will move to the platform, that is, the higher place. We call it a "refuge". When the water rises again, the platform disappears after it is submerged." Li Lixia analyzed that when the seawater rises, the sponge migrates to the edge of the platform and is quickly buried by the turbidity, so that it is completely buried.

Speaking of the meaning of fossils, Li Lixia believes that the era of the fossils was a period of late extinction from the Early Ordovician to the Early Silurian. At that time, 85% of the marine species were extinct, so the fossils at that time were very few. And it is hard to find such a preserved fossil. This is also the first time in the world to report such a complete fossilized sponge with a bone in this period. It just filled a gap in the fossil record between the Late Ordovician and the Early Silurian.

It is reported that Morocco and the Welsh region of the United Kingdom have also discovered fossils in the middle or early Ordovician period, but the fossils of this era have not yet existed. The research was funded by the National Natural Science Foundation of China. The results provided new materials for studying the changes of deep-sea ecosystems before and after the extinction and the construction of the macro-generation sponge species. It also opened up a new direction for the search for specific burial fauna at the end of the Ordovician.

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