More than a century of hard looking has turned up some signs, fossils as well as traces of biological chemistry, of enigmatic animal life before the Cambrian period
began about 541 million years ago.
Kooteninchela deppi is helping researchers to piece together more information about life on Earth during the Cambrian period
when nearly all modern animal types emerged.
Early in the Cambrian period
, which began about 542 million years ago, most multicellular animals had soft bodies that didn't fossilize well.
The rocks bearing the fossils were deposited on an ocean bottom about 520 million years ago during the Cambrian period
However this reinterpretation of Cotyledion tylodes as an entoproct places the fossil record of this group in the earlier Cambrian period
Evolution's Big Bang took place beginning 543 million years ago, in the Cambrian period
Embedded in mudstones deposited during the Cambrian period
520 million years ago in what today is the Yunnan Province in China, the approximately 3-inch-long fossil, which belongs to the species Fuxianhuia protensa, represents an extinct lineage of arthropods combining an advanced brain anatomy with a primitive body plan.
The Chinese fish come from a site near the town of Chengjiang, the world's richest locale for documenting the early part of the Cambrian period
The bad part is that communication breakdowns, traced back to the very same genome duplications of the Cambrian Period
, can cause diabetes, cancer and neurological disorders.
This evolutionary revolution spanned the end of the Precambrian era and beginning of the Cambrian period
, from some 600 million to 520 million years ago.
Mysteriously, their frond-shaped body-plan, which might have helped them gather oxygen or food, did not survive into the Cambrian period
(542-488 million years ago).
5 billion years ago to the start of the Cambrian period
543 million years ago.