Currently the boundaries of the Cambrian System, three series and six stages are defined by global stratotype sections and points. [1] The lower boundary of the Cambrian was originally held to represent the first appearance of complex life, represented by trilobites.
Cambrian Period, earliest time division of the Paleozoic Era, extending from 538.8 million to 485.4 million years ago.
The Cambrian Period marks an important point in the history of life on Earth; it is the time when many kinds of invertebrates and the first vertebrates—fishes—appeared in the fossil record.
Discover the Cambrian Period through its fossils—trilobites, early predators, and the evolutionary experiments that shaped life on Earth.
Almost every metazoan phylum with hard parts, and many that lack hard parts, made its first appearance in the Cambrian. The only modern phylum with an adequate fossil record to appear after the Cambrian was the phylum Bryozoa, which is not known before the early Ordovician.
Learn more about a time period marked by an intense burst of evolution. The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian...
The Cambrian* Period begins the Phanerozoic Eon, the last 542 million years during which fossils with hard parts have existed. It is the first division of the Paleozoic Era (542Ma -251Ma).
Opabinia made the largest single contribution to modern interest in the Cambrian explosion.
The Cambrian is the first geological period of the Palaeozoic era and the Phanerozoic eon. It lasted from 541 million years ago to 485.4 million years ago. [1] . Before it came the Ediacaran, and after it the Ordovician. Biologists have learnt quite a lot about the soft parts of Cambrian animals.