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.

2019年1月24日 · The invertebrates of the Cambrian period, over 500 million years ago, were some of the most odd-looking animals on Earth. This gallery of Cambrian fauna ranges from the aptly named Hallucigenia to the even more strange-looking Aysheaia.

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]

2022年11月13日 · The Cambrian Period ushered in an era of truly multicellular organisms. Animals with shells and exoskeletons appeared on earth for the first time during this period. They include mollusks, worms, sponges, echinoderms, trilobites, arthropods, and brachiopods.

2012年10月28日 · The Cambrian Period may be divided into three divisions: Lower (Early), Middle, and Furongian (Late). As noted above, trilobites are the most common fossil types, and these dominant animals of the Cambrian seas characterize this Period.

2025年1月11日 · Cambrian Period - Fauna, Fossils, Evolution: Cambrian faunas, like those of the present day, are commonly dominated in numbers and kind by members of the phylum Arthropoda. Calcification of skeletons by the beginning of Atdabanian time contributed to an abundant fossil record of the class Trilobita, of which some details have been discussed above.

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 …

Some of the animals of the Cambrian period. Wikimedia Commons has media related to Cambrian Animalia. This category has the following 4 subcategories, out of 4 total. The following 37 pages are in this category, out of 37 total. This list may not reflect recent changes.

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...

2023年1月23日 · During the Cambrian period, marine life flourished, but the land was desolate. By the end of the Cambrian, myriapods, arachnids, and hexapods had adapted to the land. Most continents were barren and rocky without vegetation.