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Francevillian Group Fossil

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Title: Francevillian Group Fossil  
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Subject: Paleontology, Proterozoic, Paleoproterozoic, Multicellular organism, Rhyacian
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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.[1]

The organism was 12 cm in size.[1] Their bodies were flattened disks with a characteristic morphology.[1] Their margins were scalloped and had radial slits.[2] They have an internal radial fabric.[2] 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.[1]

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.”[3][4]

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.[2]

References

See also

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
Siderian Rhyacian Orosirian Statherian Calymmian Ectasian Stenian Tonian Cryogenian Ediacaran


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