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The Abstract

The Oldest Evidence of Animal Sex Has Been Found, and It’s Mind-Boggling

Fossils unearthed in the Northwest Territories push the origins of animal sex back by 5-10 million years and reveal the earliest examples of locomotion in the fossil record.
The Oldest Evidence of Animal Sex Has Been Found, and It’s Mind-Boggling
Fossil of Dickinsonia, an early motile animal, from the lower Blueflower Formation near Sekwi Brook, Mackenzie Mountains, Northwest Territories, Canada. Image: Scott Evans

Scientists have discovered the oldest fossilized evidence of sexual reproduction and locomotion in animals at a remote site in Canada’s Northwest Territories that dates back 567 million years to the Ediacaran period, according to a study published on Wednesday in Science Advances. According to researchers, the finding pushes the origins of animal sex back by 5-10 million years. 

The newly unearthed fossils were deposited in a fossil layer known as the White Sea assemblage that is preserved in parts of Russia, Asia, and Australia, but has never been found in North America before.

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