Cambrian - Wikipedia
In contrast to later periods, the Cambrian fauna was somewhat restricted; free-floating organisms were rare, with the majority living on or close to the sea floor; [68] and mineralizing animals were rarer than in future periods, in part due to the unfavourable ocean chemistry.
Cambrian Period - Fauna, Fossils, Evolution | Britannica
6 天之前 · 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. Many hundreds of genera and thousands of ...
Category:Cambrian animals - Wikipedia
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 …
The 12 Strangest Animals of the Cambrian Period - ThoughtCo
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.
Cambrian Period | Definition, Plants, & Animals | Britannica
6 天之前 · 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 Period - Natural History Museum
2012年10月28日 · The animals (metazoans) of the Cambrian Explosion were organized into a unique marine Cambrian fauna, one of three recognized marine fauna of the Phanerozoic. This faunal ecosystem was mostly deposit feeders with nearly all animals living near the surface of …
Cambrian Period | National Geographic
The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones)...
Cambrian Period—541 to 485.4 MYA - U.S. National Park Service
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 animal fossils including soft-bodied forms.
Cambrian Period: Facts & Information - Live Science
2016年5月27日 · Among the animals that evolved during this period were the chordates — animals with a dorsal nerve cord; hard-bodied brachiopods, which resembled clams; and arthropods — ancestors of spiders,...
Cambrian Period - Fossils, Rocks, Animals | Britannica
6 天之前 · 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.