A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished ... of vertebrates into the early Cambrian,” he says, as yunnanozoan fossils predate the time vertebrates were thought ...

These familiar marine arthropods first arose about 545 million years ago in the early Cambrian and thrived throughout the world's oceans until they were wiped out in the Permian extinctions about ...

It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems. First, organisms may not have sequestered and secreted much in the way of fossilizable ...

visitors can follow fossil evidence tracing the evolution of life during the Cambrian period — the first geological period of the Paleozoic era — which lasted from 541 million to 485 million ...

dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...

Since its discovery in 1910, a creature from the Middle Cambrian known as Pikaia gracilens ... early member of Chordata… but maybe not the first. The University of Cambridge’s Giovanni Mussini ...

"The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling the Cambrian Explosion ...