The Early Cambrian is an geological epoch that is part of the Cambrian Era. It is defined to span from 542 Mya to 513 Mya. It is also known as the Lower Cambrian. The Cambrian explosion of complex organisms occurred during the Early Cambrian. The geologic timescale is used by geologists and other scientists to describe the timing and relationships between events that have occured during the history of the Earth. ... The Cambrian is a major division of the geologic timescale that begins about 542 million years before the present (BP) at the end of the Proterozoic eon and ended about 490 million years BP with the beginning of the Ordovician period. ... In astronomy, geology, and paleontology, mya is an acronym for million years ago and is used as a unit of time to denote length of time before the present. ... In astronomy, geology, and paleontology, mya is an acronym for million years ago and is used as a unit of time to denote length of time before the present. ... The Cambrian Explosion is the seemingly sudden appearance of a number of new complex organisms between 543 and 530 million years ago (MYA). ...
The Cambrian is a major division of the geologic timescale that begins about 542 mya (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
The lower boundary of the Cambrian was traditionally set at the earliest appearance of early arthropods known as trilobites and of primitive reef-forming animals known as archeocyathids.
Cambrian continents are thought to have resulted from the breakup of a neoproterozoic supercontinent called Rodinia.
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