Francevillian Group Fossil
The Francevillian Group Fossil is representative of Palaeoproterozoic, macroscopic organisms which were roughly centimeter-sized, highly organized, spatially discrete, and which formed colonies. Their fossils are found in the west-African country of Gabon in the Palaeoproterozoic Francevillian B Formation, a 2.1-Gyr-old black shale province.
The organism was 12 cm in size. Their bodies were flattened disks with a characteristic morphology. Their margins were scalloped and had radial slits. They have an internal radial fabric. The geochemistry of the fossil site indicates that they lived on the sediment under an oxygenated water column of a prograding delta, and they might have engaged in aerobic respiration.
The lead author, Abderrazak El Albani, said, “The discovery is fantastic because it shows the existence of multicellular fauna 1.5 billion years earlier than what we know. … This is important to understand the evolution of life on Earth.”
Charles Darwin predicted that fossils would be found in the Precambrian rocks. The discovery of these fossils adds to the Precambrian fossil record, and satisfies his predictions about evolutionary history.
|Preceded by Archean Eon||2.5 Ga - Proterozoic Eon - 542 Ma||Followed by Phanerozoic Eon|
|2.5 Ga - Paleoproterozoic Era -1.6 Ga||1.6 Ga - Mesoproterozoic Era -1.0 Ga||1.0 Ga - Neoproterozoic Era -542 Ma|
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