Assorted microfossils from the Ediacaran Khesen Formation, Mongolia. Each fossil is on the order of 200 microns maximum dimension. | Yale University

Mongolian Microfossils Could Be Earth’s First Animals

Tiny fossils no larger than the thickness of a human fingernail could represent the base of the animal kingdom’s tree of life.

Published On 10/26/2017
10:21 AM EDT
Reconstructions showing what many researchers believe is a 600-million-year-old animal embryo undergoing cellular division. The images were based on three-dimensional X-ray views of microfossils found at Doushantuo Formation, South China. | Geology and Zongjun Yin of the Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences
A researcher working at the Doushantuo Formation in China | Wikimedia Commons