The Precambrian eon is vast, almost unimaginably so. In fact, before some fossil discoveries were made late in the 20th century, it was considered unknowable -- evolution's dark ages. The Precambrian ...

A fascinating fossil discovery in remote South Australia sheds light on an important chapter in the history of life on Earth: the origins of Ecdysozoa, a vast superphylum that includes molting animals ...

For the first time since 1891, the geologic timescale is getting a new period. In March the International Union of Geological Scientists added the Ediacaran Period to the Precambrian Eon, an enormous ...

A 555-million-year-old fossil found in South Australia provides crucial evidence for the Precambrian origins of Ecdysozoa, which encompasses insects, crustaceans, and nematodes. The discovery of Uncus ...

The largest unit of defined geologic time is the supereon. Only one is defined, the Precambrian spanning from the formation of the Earth to right before life goes crazy in the Cambrian explosion (4.6 ...