The origin and early evolution of animals have been a fascinating topic since Charles Darwin. certain early animal fossils largely appear from early Cambrian,so the fossil records are often interpreted as documenting a "Cambrian explosion" of animals. The phosphatized embryo-like fossils displaying cellular and subcellular structures from Ediacaran Doushantuo Formation, South China, and provide an unparalleled snapshot of life before the Cambrian.
Source: phys.org