Cambrian Period | Definition, Plants, & Animals | Britannica
2025年1月11日 · Cambrian Period, earliest time division of the Paleozoic Era and Phanerozoic Eon, lasting from 538.8 million to 485.4 million years ago. The Cambrian System, named by English geologist Adam Sedgwick for slaty rocks in southern Wales and southwestern England, contains the earliest record of abundant and varied life-forms.
Cambrian - Wikipedia
The Cambrian (/ ˈ k æ m b r i. ə n, ˈ k eɪ m-/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. [5] The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma. [1]
Cambrian Period: Facts & Information - Live Science
2016年5月27日 · The Cambrian Explosion was a dramatic burst of evolutionary changes in life on Earth. During the Cambrian Period, which began about 540 million years, trilobites were the dominant species.
Cambrian Period | National Geographic
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...
Cambrian Period - Natural History Museum
2012年10月28日 · 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).
Cambrian Period—541 to 485.4 MYA - U.S. National Park Service
5 天之前 · 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. The Burgess Shale contains the best record of …
Cambrian Period summary | Britannica
Cambrian Period, Oldest time division of the Paleozoic Era. During the Cambrian, 541–485.4 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.
Cambrian Period: Facts, Information, and Timeline - A-Z Animals
2022年11月13日 · Scientists regard the Cambrian Period as the part of the Paleozoic Era that generated the most substantial evolutionary surge known to man. The Cambian Period contrasts with the Precambrian period, primarily characterized by a slow progression in evolution.
Cambrian Period - Fossils, Rocks, Animals | Britannica
2025年1月11日 · Cambrian Period - Fossils, Rocks, Animals: Cambrian rocks have a special biological significance, because they are the earliest to contain diverse fossils of animals. These rocks also include the first appearances of most animal phyla that have fossil records.
The Cambrian Period - University of California Museum of …
The Cambrian Period marks an important point in the history of life on Earth; it is the time when most of the major groups of animals first appear in the fossil record. This event is sometimes called the "Cambrian Explosion," because of the relatively short time over which this diversity of …