Scottish researchers said they have discovered the oldest known fossils in Namibia. The fossils are called animal-made reefs. It was formed by a small seafloor filter feeder called Cloudina 548 million years ago. This discovery suggests that important evolutionary evolution evolved millions of years ago before the so-called Cambrian explosion, and many major animal tissues first appeared. It also shows that reef-building marine invertebrates are similar to today's coral reefs and are 18 million years earlier than previously known.
Cloudina, one of the early earth animals, was the first creature to evolve a hard skeleton. Its fossils were found in Europe, North and South America, Asia, and Africa but nobody knew beforehand that it built coral reefs - protecting themselves from predators and facilitating food collection. These Cloudina coral reefs are the earliest known animal-built structures. Built from early microbes 300 million years ago.
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