View your list of saved words. (You can log in using Facebook.)
Oldest time division of the Paleozoic Era. During the Cambrian, 542–488.3 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with less variation between regions. There were no land plants or animals, but there were marine organisms with either shells or skeletons. Because the dominant animals were trilobites, the Cambrian is sometimes referred to as the Age of Trilobites.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Cambrian Period, visit Britannica.com.
Seen & Heard
What made you look up Cambrian Period? Please tell us what you were reading, watching or discussing that led you here.